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A024293 Expansion of e.g.f. log(1+sin(x)^2)/2 (even-indexed coefficients). 1
0, 1, -10, 256, -13840, 1282816, -181649920, 36478744576, -9861412096000, 3452931391553536, -1520176422094766080, 821908023102140317696, -535369559186849435484160, 413508899951810581475885056, -373681769282729298809313034240, 390605070751731814007608616943616 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Log[1+Sin[x]^2]/2, {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, May 21 2014 *)

CROSSREFS

Cf. A009344.

Sequence in context: A251588 A126468 A336665 * A120268 A001824 A024294

Adjacent sequences:  A024290 A024291 A024292 * A024294 A024295 A024296

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs Mar 1997

Prior Mathematica program replaced by Harvey P. Dale, May 21 2014

STATUS

approved

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Last modified May 7 14:09 EDT 2021. Contains 343650 sequences. (Running on oeis4.)