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A013125
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Expansion of E.g.f.: tanh(tanh(x)+log(x+1))=2*x-1/2!*x^2-16/3!*x^3+42/4!*x^4+492/5!*x^5...
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0
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0, 2, -1, -16, 42, 492, -3210, -30168, 404264, 2783952, -75206520, -292604288, 19217701008, 3111794272, -6389076941520, 29520888356032, 2643629755167360, -29037077579992832, -1307061634619873664
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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[{nn=20}, CoefficientList[Series[Tanh[Tanh[x]+Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, May 27 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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Patrick Demichel (patrick.demichel(AT)hp.com)
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EXTENSIONS
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Zero prepended and definition clarified by Harvey P. Dale, May 27 2018
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STATUS
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approved
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