A024262 - OEIS

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A024262

Expansion of tanh(sin(x)^2)/2.

0, 1, -4, -104, 6656, -40064, -42409984, 4996996096, 379877605376, -280033142964224, 36077603872833536, 18835361007974219776, -11364456303888437346304, 367251340814801013047296, 3076185618615703435483283456, -1692496413849432696569477464064

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OFFSET

0,3

LINKS

Table of n, a(n) for n=0..15.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Tanh[Sin[x]^2]/2, {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Jun 03 2014 *)

CROSSREFS

Cf. A009801.

Sequence in context: A302733 A098696 A013054 * A012958 A012984 A202683

Adjacent sequences: A024259 A024260 A024261 * A024263 A024264 A024265

KEYWORD