OFFSET
0,3
LINKS
N. J. A. Sloane, Transforms
FORMULA
a(n) ~ n^n / cosh(1). - Vaclav Kotesovec, Jun 08 2019
MATHEMATICA
Table[n! SeriesCoefficient[Exp[n x]/Cosh[x], {x, 0, n}], {n, 0, 19}]
Table[2^n EulerE[n, (n + 1)/2], {n, 0, 19}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Apr 10 2018
STATUS
approved