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A009261
E.g.f.: Expansion of exp(tanh(tanh(x))).
0
1, 1, 1, -3, -15, 33, 513, -403, -31007, -41247, 2881089, 12404989, -376412847, -3175861439, 64825974593, 925805229229, -13951231536191, -320290449542079, 3556538162237313, 131747901365358205, -998391201911168335
OFFSET
0,4
MATHEMATICA
With[{nn=30}, CoefficientList[Series[Exp[Tanh[Tanh[x]]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Apr 08 2013 *)
CROSSREFS
Sequence in context: A211441 A086380 A324303 * A372735 A331249 A102790
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
Definition clarified by Harvey P. Dale, Apr 08 2013
STATUS
approved