A009787 Expansion of tanh(log(1+x)/cosh(x)).

0, 1, -1, -3, 12, 35, -435, -161, 23968, -68811, -1874205, 15189361, 177102156, -3209424153, -15134777567, 750725838563, -828777844320, -197682938738071, 1577204564247783, 55820827940141285, -1005440186803008980

Offset

0,4

Links

Table of n, a(n) for n=0..20.

Mathematica

Tanh[ Log[ 1+x ]/Cosh[ x ] ]

Crossrefs

Sequence in context: A320346 A305542 A232899 * A135190 A101069 A225259

Adjacent sequences: A009784 A009785 A009786 * A009788 A009789 A009790

Keyword

sign,easy

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved