EulerE

EulerE[n] gives the Euler number E_n. EulerE[n, x] gives the Euler polynomial E_n(x).

Examples

Euler numbers:

Table[EulerE[n], {n, 0, 6}]
(* {1, 0, -1, 0, 5, 0, -61} *)

Euler polynomial:

EulerE[2, x]
(* x^2 - x *)

Please visit the official Wolfram Language Reference for more details.