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A009347
Expansion of log(1+sinh(sinh(x))).
0
0, 1, -1, 4, -14, 76, -472, 3592, -31600, 317968, -3600384, 45286528, -626654976, 9459412288, -154690373632, 2724254181760, -51403730941952, 1034595588065536, -22124602307346432, 500961002883890176
OFFSET
0,4
MATHEMATICA
Log[ 1+Sinh[ Sinh[ x ] ] ]
CROSSREFS
Sequence in context: A007282 A222900 A222485 * A341505 A231510 A161132
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved