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 A024282 Expansion of e.g.f. tanh(x)*sin(sin(x))/2, even powers only. 2
 0, 1, -8, 124, -3168, 121232, -6609664, 491033408, -47878820864, 5942382135552, -915386669357056, 171409533142952960, -38347910567533715456, 10102227232688591245312, -3095277524018668920373248 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..100 FORMULA a(n) ~ (-1)^(n+1) * sinh(sinh(Pi/2)) * 2^(2*n+1) * (2*n)! / Pi^(2*n+1). - Vaclav Kotesovec, Apr 20 2014 MATHEMATICA With[{nn=30}, Take[CoefficientList[Series[Tanh[x]Sin[Sin[x]]/2, {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Oct 20 2013 *) PROG (PARI) A024282=n->{my(t=x+O(x^(2*n+!n))); polcoeff(tanh(t)*sin(sin(t)), n*2, x)/2*(2*n)!} \\ M. F. Hasler, Feb 09 2014 CROSSREFS Cf. A009833. Sequence in context: A302356 A069459 A254125 * A231638 A065082 A053058 Adjacent sequences:  A024279 A024280 A024281 * A024283 A024284 A024285 KEYWORD sign AUTHOR EXTENSIONS Extended with signs by Olivier Gérard, Mar 15 1997 Prior Mathematica program replaced by Harvey P. Dale, Oct 20 2013 Clarified definition, Joerg Arndt, Feb 09 2014 STATUS approved

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Last modified October 21 06:01 EDT 2019. Contains 328291 sequences. (Running on oeis4.)