A009821 Expansion of tanh(tanh(x))*exp(x).

0, 1, 2, -1, -12, 37, 358, -1517, -19352, 108393, 1709194, -11820345, -222722596, 1828543693, 40122780142, -380880450277, -9543330683696, 102776857839441, 2895895566420498, -34874008165786609, -1091590070839432764

Offset

0,3

Links

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

Mathematica

Tanh[ Tanh[ x ] ]*Exp[ x ]

Crossrefs

Sequence in context: A012926 A013157 A062742 * A009831 A012931 A013159

Adjacent sequences: A009818 A009819 A009820 * A009822 A009823 A009824

Keyword

sign,easy

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved