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A009720 Expansion of tan(tanh(x)*cos(x)). 0
1, -3, -43, 2009, 6313, -9872907, 760322045, 105243758801, -41122814903471, 1873399639193325, 3032918686052577317, -1060046322104258754871, -196239553045718536023047, 335369132729230015620066021 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..13.

MATHEMATICA

Tan[ Tanh[ x ]*Cos[ x ] ] (* Odd Part *)

CROSSREFS

Sequence in context: A274387 A136648 A114337 * A201173 A190637 A076361

Adjacent sequences:  A009717 A009718 A009719 * A009721 A009722 A009723

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

STATUS

approved

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Last modified May 23 23:53 EDT 2017. Contains 286937 sequences.