Index: src/0dev.org/encoding/fibonacci/fib.go
==================================================================
--- src/0dev.org/encoding/fibonacci/fib.go
+++ src/0dev.org/encoding/fibonacci/fib.go
@@ -1,41 +1,37 @@
-// Package provides a shifted, reversed fibonacci encoding of bytes
+// Package provides a shifted, reversed fibonacci encoding of unsigned integers.
 //
 // http://en.wikipedia.org/wiki/Fibonacci_coding maps positive integers as
 // 1 - 11, 2 - 011, 3 - 0011, 4 - 1011, 5 - 00011
 //
-// Incrementing input bytes by one to allow for zero gives
+// Incrementing input by one to allow for zero gives
 // 0 - 11, 1 - 011, 2 - 0011, 3 - 1011, 4 - 00011
 //
 // The codes are then reversed so that they are easily stored in uints
 // 0 - 11, 1 - 110, 2 - 1100, 3 - 1101, 4 - 11000
 package fibonacci
 
 type Numbers []uint64
 
-// Returns the n-th fibonacci number
-// The result is stored after calculation
-func (f Numbers) Nth(index int) uint64 {
-	switch {
-	case index <= 1:
-		return 1
-	case f[index] > 0:
-		break
-	default:
-		f[index] = f.Nth(index-1) + f.Nth(index-2)
-	}
-	return f[index]
-}
-
-// Returns a fibonacci code for an integer as specified in the package doc.
+// Returns a slice with fibonacci numbers up to the given length
+func New(size int) Numbers {
+	var fibs Numbers = make(Numbers, size)
+	copy(fibs, []uint64{1, 1})
+	for i := 2; i < size; i++ {
+		fibs[i] = fibs[i-1] + fibs[i-2]
+	}
+	return fibs
+}
+
+// Returns a fibonacci code for an integer as specified in the package's doc.
 func (f Numbers) Code(value uint64) (result uint64) {
 	// Increment to encode zero as one
 	value++
 
 	// Find the nearest fibonacci number
 	i := 0
-	for f.Nth(i+1) <= value {
+	for f[i+1] <= value {
 		i++
 	}
 
 	// Leading bit that signals the start of a fibonacci-encoded integer
 	result |= 1
@@ -43,25 +39,26 @@
 	// Find the Zeckendorf's representation by raising a bit for each
 	// fibonacci number that is less or equal to the difference
 	// between the value and the previous such number
 	for ; i >= 1; i-- {
 		result <<= 1
-		if f.Nth(i) <= value {
+		if f[i] <= value {
 			result |= 1
-			value -= f.Nth(i)
+			value -= f[i]
 		}
 	}
 	return
 }
 
-// Returns an integer from a fibonacci code as specified in the package doc.
+// Returns an integer from a fibonacci code as specified in the package's doc.
 func (f Numbers) Decode(value uint64) (result uint64) {
 	i := 1
+	// Loop until the lowest two bits are both raised
 	for (value & 3) != 3 {
 		// Add the fibonacci number for the current bit if it is raised
 		if (value & 1) == 1 {
-			result += f.Nth(i)
+			result += f[i]
 
 			// We know that the next bit cannot be raised by Zeckendorf's theorem
 			value >>= 2
 			i += 2
 			continue
@@ -68,8 +65,8 @@
 		}
 
 		value >>= 1
 		i++
 	}
-	result += f.Nth(i) - 1
+	result += f[i] - 1
 	return
 }

Index: src/0dev.org/encoding/fibonacci/fib_test.go
==================================================================
--- src/0dev.org/encoding/fibonacci/fib_test.go
+++ src/0dev.org/encoding/fibonacci/fib_test.go
@@ -3,24 +3,24 @@
 import (
 	"testing"
 )
 
 func TestNumbers(t *testing.T) {
-	n := make(Numbers, 32)
+	n := New(32)
 
 	expected := []uint64{1, 1, 2, 3, 5, 8, 13, 21}
 
 	for i, v := range expected {
 
-		if f := n.Nth(i); f != v {
+		if f := n[i]; f != v {
 			t.Error("Unexpected value for", i, f, "expected", v)
 		}
 	}
 }
 
 func TestCoding(t *testing.T) {
-	n := make(Numbers, 32)
+	n := New(32)
 
 	for i := uint64(0); i < 1024; i++ {
 		enc := n.Code(i)
 		dec := n.Decode(enc)
 		if i != dec {