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A013051
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Expansion of e.g.f. tanh(sinh(x)+tan(x)) (odd powers only).
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0
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2, -13, 289, -13039, 1003825, -118036631, 19683093369, -4418337316175, 1284612873046753, -469616483548721575, 210832414586400163561, -114033567896612568885023, 73135588741410223752308241, -54879566868084569212176674615, 47633391630419948548873776142041
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OFFSET
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1,1
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LINKS
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EXAMPLE
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2*x-13/3!*x^3+289/5!*x^5-13039/7!*x^7...
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Tanh[Sinh[x]+Tan[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, May 11 2022 *)
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PROG
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(PARI) my(x='x + O('x^40), v=Vec(serlaplace(tanh(sinh(x)+tan(x))))); vector(#v\2, k, v[2*k-1]) \\ Michel Marcus, Jun 20 2020
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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Patrick Demichel (patrick.demichel(AT)hp.com)
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EXTENSIONS
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STATUS
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approved
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