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A013289
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Expansion of e.g.f. tanh(log(x+1) - tanh(x)).
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1
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0, 0, -1, 4, -6, 8, -90, 152, 6440, -69984, 451080, -4819168, 67077648, -533622208, 882593712, 16010702528, -325947073920, 15149145074176, -402497641556352, 6097893929134592, -75930618112953600, 1338998058465717248, -21267088125132503808
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OFFSET
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0,4
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LINKS
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EXAMPLE
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-(1/2!)*x^2 + (4/3!)*x^3 - (6/4!)*x^4 + (8/5!)*x^5 - ...
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MATHEMATICA
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Range[0, 25]! CoefficientList[Series[Tanh[Log[x + 1] - Tanh[x]], {x, 0, 25}], x] (* Vincenzo Librandi, Aug 03 2018 *)
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PROG
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(Magma) m:=30; R<x>:=PowerSeriesRing(Rationals(), m); b:=Coefficients(R!(1+Tanh(Log(x+1) - Tanh(x)))); [0] cat [Factorial(n-1)*b[n]: n in [2..m]]; // Vincenzo Librandi, Aug 03 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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a(0)=a(1)=0 inserted and title improved by Sean A. Irvine, Aug 03 2018
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STATUS
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approved
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