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A009547
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Expansion of e.g.f. sin(x)*sin(sinh(x)) (even powers only).
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2
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0, 2, -4, -42, -8, 5354, 99956, 22974, -72550928, -3076799278, -44239291156, 4012843624614, 426360266016232, 20979538126746554, -55444364705437852, -137742540801276301170, -16928772211833384004640
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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With[{nmax = 50}, CoefficientList[Series[Sin[x]*Sin[Sinh[x]], {x, 0, nmax}], x]*Range[0, nmax]!][[1 ;; ;; 2]] (* G. C. Greubel, Jan 20 2018 *)
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PROG
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(PARI) x='x+O('x^50); v=Vec(serlaplace(sin(x)*sin(sinh(x)))); concat([0], vector(#v\2, n, v[2*n-1])) // G. C. Greubel, Jan 20 2018
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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