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A009774 Expansion of tanh(ln(1+tanh(x))). 0
0, 1, -1, -2, 14, -14, -286, 1828, 3464, -130664, 619304, 7421008, -128214736, 153779536, 18052524944, -209102239712, -1370716606336, 63200892286336, -414519986847616, -12766540334296832, 303340786629265664 (list; graph; refs; listen; history; internal format)
OFFSET

0,4

MATHEMATICA

Tanh[ Log[ 1+Tanh[ x ] ] ]

CROSSREFS

Sequence in context: A174706 A072163 A084674 * A032933 A194230 A109993

Adjacent sequences:  A009771 A009772 A009773 * A009775 A009776 A009777

KEYWORD

sign,easy

AUTHOR

R. H. Hardin (rhhardin(AT)att.net)

EXTENSIONS

Extended with signs Mar 15 1997 by Olivier Gerard.

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Last modified February 15 04:23 EST 2012. Contains 205694 sequences.