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A009762 Expansion of tan(x)/cosh(tan(x)). 0
1, -1, -19, -253, -1415, 164999, 15064037, 949320395, 44870780017, 1646995429391, 436144142262365, 216025221401835155, 72522443306062946281, 18012134571875515731095, 2730160186702754555432789 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..14.

MATHEMATICA

Tan[ x ]/Cosh[ Tan[ x ] ] (* Odd Part *)

CROSSREFS

Sequence in context: A021202 A125454 A293917 * A017952 A055433 A185425

Adjacent sequences:  A009759 A009760 A009761 * A009763 A009764 A009765

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

STATUS

approved

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Last modified October 17 16:18 EDT 2018. Contains 316285 sequences. (Running on oeis4.)