A012365 Expansion of e.g.f.: sech(tan(x)*exp(x))=1-1/2!*x^2-6/3!*x^3-27/4!*x^4-60/5!*x^5...

1, 0, -1, -6, -27, -60, 483, 9422, 92393, 507528, -2635609, -125548830, -2109466227, -20314641204, 35281684683, 6713017752758, 172379768794193, 2531995009465104, 6214077724791503, -977218995921967926

Offset

0,4

Links

Table of n, a(n) for n=0..19.

Mathematica

With[{nn=20}, CoefficientList[Series[Sech[Tan[x]Exp[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Oct 21 2018 *)

Crossrefs

Sequence in context: A174974 A273578 A012720 * A217189 A363696 A167469

Adjacent sequences: A012362 A012363 A012364 * A012366 A012367 A012368

Keyword

sign

Author

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

Extensions

Definition clarified by Harvey P. Dale, Oct 21 2018

Status

approved