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A024289 Expansion of tan(tan(x)).x/2. 0
0, 1, 8, 216, 11584, 1019520, 132672000, 23886564352, 5679985229824, 1723355387559936, 649567394309734400, 297722967189644902400, 163056718857998098759680, 105162437290880582018924544 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

MATHEMATICA

Tan[ Tan[ x ] ]*x/2 (* Even Part *)

CROSSREFS

A009700.

Sequence in context: A123057 A009072 A002897 * A009106 A000442 A268471

Adjacent sequences:  A024286 A024287 A024288 * A024290 A024291 A024292

KEYWORD

nonn

AUTHOR

R. H. Hardin

EXTENSIONS

Extended and signs tested 03/97.

STATUS

approved

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Last modified February 19 07:51 EST 2019. Contains 320309 sequences. (Running on oeis4.)