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A009549
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Expansion of e.g.f. sin(x)*sin(tanh(x)) (even powers only).
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2
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0, 2, -16, 288, -9920, 541184, -42274816, 4449451776, -605255720960, 103187353223168, -21528004660707328, 5391886872902762496, -1595781555670951657472, 550728986895462989103104
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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[Tanh[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(tanh(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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