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A009830 Expansion of tanh(x).exp(tan(x)). 0
0, 1, 2, 1, 4, 41, 198, 673, 4040, 41425, 316874, 2148961, 19176268, 225227705, 2374489614, 23880701185, 282825044624, 3905967813793, 52279148694674, 689701934465089, 10130169154611604, 163751563593866057 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..21.

MATHEMATICA

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

CROSSREFS

Sequence in context: A174941 A267381 A061655 * A053374 A227050 A093876

Adjacent sequences:  A009827 A009828 A009829 * A009831 A009832 A009833

KEYWORD

nonn,easy

AUTHOR

R. H. Hardin

EXTENSIONS

Extended and signs tested Mar 15 1997 by Olivier Gérard.

STATUS

approved

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Last modified May 22 23:18 EDT 2022. Contains 353959 sequences. (Running on oeis4.)