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 A009150 Expansion of e.g.f. cosh(sin(x)^2) (even coefficients). 1
 1, 0, 12, -240, 5712, -266880, 18566592, -1488963840, 141287377152, -16736203345920, 2412897423240192, -402658140395089920, 76287123858146906112, -16430034737688309104640, 4011640516519571786022912, -1097783068806961397511290880 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Alois P. Heinz, Table of n, a(n) for n = 0..100 FORMULA a(n) = (2*n)! * [x^(2*n)] cosh(sin(x)^2). MAPLE a:= n-> coeff(series(cosh(sin(x)^2), x, 2*n+1), x, 2*n)*(2*n)!: seq ( a(n), n=0..20);  # Alois P. Heinz, Aug 15 2012 MATHEMATICA With[{nn=30}, Take[CoefficientList[Series[Cosh[Sin[x]^2], {x, 0, nn}], x]Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Aug 15 2012 *) CROSSREFS Sequence in context: A119837 A012538 A006588 * A009080 A002166 A034910 Adjacent sequences:  A009147 A009148 A009149 * A009151 A009152 A009153 KEYWORD sign AUTHOR EXTENSIONS Extended with signs by Olivier Gérard, Mar 15 1997 More terms from, and definition clarified by, Harvey P. Dale, Aug 15 2012 STATUS approved

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Last modified April 18 14:58 EDT 2021. Contains 343089 sequences. (Running on oeis4.)