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A012652
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Expansion of e.g.f.: tan(tanh(x) * log(x+1)).
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0
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0, 0, 2, -3, 0, -10, 400, -3276, 12768, -72864, 1933888, -32108560, 322393280, -3122225184, 60417280768, -1349906937120, 23068109840384, -351887538631168, 6985288388898816, -174933529672527360
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OFFSET
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0,3
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LINKS
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EXAMPLE
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2/2!*x^2 - 3/3!*x^3 - 10/5!*x^5 + 400/6!*x^6 ...
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MATHEMATICA
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With[{nn=20}, CoefficientList[Series[Tan[Tanh[x]Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jun 19 2022 *)
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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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a(0) and a(1) inserted and title improved by Sean A. Irvine, Jul 23 2018
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STATUS
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approved
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