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A009767 Expansion of tan(tanh(x))*sin(x)/2. 0
1, 120, 241920, 2352430080, 70008319180800, 4981141593037209600, 724337282211580477440000, 193082117289145211195228160000, 87097726450270042926290105794560000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..8.

MATHEMATICA

Tan[ x^2 ]/2 (* [ x^(4n+2) ] *)

CROSSREFS

A024348.

Sequence in context: A172805 A008701 A158043 * A181750 A003789 A046987

Adjacent sequences:  A009764 A009765 A009766 * A009768 A009769 A009770

KEYWORD

nonn

AUTHOR

R. H. Hardin

EXTENSIONS

Extended and signs tested 03/97.

STATUS

approved

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Last modified October 20 22:05 EDT 2018. Contains 316404 sequences. (Running on oeis4.)