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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
OFFSET
0,5
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: A224090 A013327 A359625 * A334254 A230582 A011186
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved