A012531 sec(sinh(x)*sin(x)) = 1+12/4!*x^4+7952/8!*x^8+36180672/12!*x^12...

1, 12, 7952, 36180672, 603907465472, 26832156798077952, 2614680400223651827712, 490948618119249163449188352, 161900900520087402624595511017472

Offset

0,2

Links

Table of n, a(n) for n=0..8.

Mathematica

With[{nn=50}, Take[CoefficientList[Series[Sec[Sinh[x]Sin[x]], {x, 0, nn}], x] Range[0, nn-2]!, {1, -1, 4}]] (* Harvey P. Dale, Sep 22 2022 *)

Crossrefs

Sequence in context: A107251 A201493 A009173 * A013481 A013513 A013480

Adjacent sequences: A012528 A012529 A012530 * A012532 A012533 A012534

Keyword

nonn

Author

Patrick Demichel (patrick.demichel(AT)hp.com)

Status

approved