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A009349 Expansion of log(1+sinh(tanh(x))). 0
0, 1, -1, 1, -2, 1, 8, 169, -1360, -1823, 36096, 365905, -4324608, -17126303, 252720128, 3688466617, -44566194176, -393996411839, 4256810139648, 109259290725793, -1089707691474944, -20477152840654271, 132632440281759744 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Table of n, a(n) for n=0..22.

MATHEMATICA

With[{nn=30}, CoefficientList[Series[Log[1+Sinh[Tanh[x]]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Oct 24 2011 *)

CROSSREFS

Sequence in context: A239444 A224090 A013327 * A334254 A230582 A011186

Adjacent sequences:  A009346 A009347 A009348 * A009350 A009351 A009352

KEYWORD

sign,easy

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

STATUS

approved

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Last modified November 26 01:22 EST 2020. Contains 338631 sequences. (Running on oeis4.)