A024253 - OEIS

A024253

Expansion of sin(sin(x))*x/2.

0, 1, -4, 36, -512, 9360, -225600, 6935488, -258670592, 11453942016, -595273139200, 35778886145024, -2452254890065920, 189732604997505024, -16441271556334370816, 1583926386391039918080, -168491094250200804360192

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OFFSET

0,3

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..100

MATHEMATICA

With[{nn=40}, Take[CoefficientList[Series[Sin[Sin[x]]x/2, {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Oct 04 2011 *)

CROSSREFS

Cf. A009478.

Sequence in context: A366337 A008546 A277404 * A052746 A145084 A179422

Adjacent sequences: A024250 A024251 A024252 * A024254 A024255 A024256

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs Mar 1997

STATUS

approved