A012763 - OEIS

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A012763

Expansion of e.g.f.: sech(cosh(x)*log(x+1))=1-1/2!*x^2+3/3!*x^3-18/4!*x^4+60/5!*x^5...

1, 0, -1, 3, -18, 60, -60, -1890, 31472, -319032, 2369280, -6374280, -209401368, 5594400240, -90523285944, 1016295254520, -3922383447232, -184920315173888, 6878045401558272, -151394798389814208

(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[Cosh[x]Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Aug 02 2018 *)

CROSSREFS

Sequence in context: A061317 A190313 A139362 * A006011 A012779 A327768

Adjacent sequences: A012760 A012761 A012762 * A012764 A012765 A012766

KEYWORD

sign

AUTHOR

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

EXTENSIONS

Definition clarified by Harvey P. Dale, Aug 02 2018

STATUS

approved