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A009352 E.g.f: log(1+sinh(x))*cosh(x). 1
0, 1, -1, 6, -16, 80, -421, 2800, -21736, 194304, -1961521, 22060544, -273408136, 3701321728, -54335326501, 859630860288, -14579917279216, 263892101169152, -5076781293615361, 103444435675512832, -2225448965436594976 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

FORMULA

a(n) ~ (n-1)! * (-1)^(n+1) * sqrt(2) / (log(1+sqrt(2)))^n. - Vaclav Kotesovec, Jan 23 2015

MATHEMATICA

With[{nn=30}, CoefficientList[Series[Log[1+Sinh[x]]Cosh[x], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jun 04 2013 *)

CROSSREFS

Sequence in context: A211954 A230942 A188570 * A056204 A091148 A210370

Adjacent sequences:  A009349 A009350 A009351 * A009353 A009354 A009355

KEYWORD

sign,easy

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

Definition clarified and Mathematica program replaced by Harvey P. Dale, Jun 04 2013

STATUS

approved

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Last modified September 19 00:22 EDT 2021. Contains 347549 sequences. (Running on oeis4.)