EULER _ _ _ _ _ _ _ _ _ _ _ _ operator

The EULER operator returns the nth Euler number.

syntax:

examples:

Euler 20; 

  370371188237525 


Euler 0; 

  1

The Euler numbers are evaluated by a recursive algorithm which makes it hard to compute Euler numbers above say 200.

Euler numbers appear in the coefficients of the power series representation of 1/cos(z).