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A009037
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Expansion of E.g.f. cos(sin(sin(x))), even powers only.
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1
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1, -1, 9, -153, 4273, -177489, 10342137, -800697641, 78896218081, -9587206592289, 1403875965476969, -243412313149166137, 49273184499900888465, -11506634193913551650161, 3067851166645384439929945
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OFFSET
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0,3
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LINKS
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G. C. Greubel, Table of n, a(n) for n = 0..250
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MATHEMATICA
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With[{nmax = 60}, CoefficientList[Series[Cos[Sin[Sin[x]]], {x, 0, nmax}], x]*Range[0, nmax]!][[1 ;; -1 ;; 2]] (* G. C. Greubel, Jul 22 2018 *)
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PROG
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(PARI) x='x+O('x^60); v=Vec(serlaplace(cos(sin(sin(x))))); vector(#v\2, n, v[2*n-1]) \\ G. C. Greubel, Jul 22 2018
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CROSSREFS
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Sequence in context: A217823 A113391 A045755 * A012148 A193540 A193543
Adjacent sequences: A009034 A009035 A009036 * A009038 A009039 A009040
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KEYWORD
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sign
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AUTHOR
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R. H. Hardin
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EXTENSIONS
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Extended with signs by Olivier Gérard, Mar 15 1997
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STATUS
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approved
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