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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... 0
1, 0, -1, -6, -27, -60, 483, 9422, 92393, 507528, -2635609, -125548830, -2109466227, -20314641204, 35281684683, 6713017752758, 172379768794193, 2531995009465104, 6214077724791503, -977218995921967926 (list; graph; refs; listen; history; text; internal format)
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 A167469 A190623

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

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Last modified May 20 16:54 EDT 2022. Contains 353876 sequences. (Running on oeis4.)