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A009275
Expansion of exp(tanh(x)/cosh(x)).
0
1, 1, 1, -4, -19, 12, 517, 1472, -18023, -159792, 587529, 16362304, 19183749, -1834702400, -12219870323, 218477736448, 3379214470193, -23399883425536, -883981857320943, 225490426670080, 238930492488456221
OFFSET
0,4
MATHEMATICA
Exp[ Tanh[ x ]/Cosh[ x ] ]
CROSSREFS
Sequence in context: A024572 A357818 A009267 * A362249 A070612 A165820
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved