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A009789
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Expansion of e.g.f.: tanh(log(1+x)^2).
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2
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0, 0, 2, -6, 22, -100, 308, 1512, -51144, 869472, -12648528, 168624720, -2029008720, 19500193440, -52358834400, -4526884091520, 184448883292800, -5247799551052800, 128265498107293440, -2787299439278250240
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OFFSET
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0,3
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LINKS
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Table of n, a(n) for n=0..19.
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EXAMPLE
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tanh(log(x+1)^2) = 2/2!*x^2-6/3!*x^3+22/4!*x^4-100/5!*x^5...
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MATHEMATICA
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With[{nn=20}, CoefficientList[Series[Tanh[Log[1+x]^2], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Mar 05 2016 *)
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CROSSREFS
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Sequence in context: A318974 A012269 A012272 * A012271 A012266 A009468
Adjacent sequences: A009786 A009787 A009788 * A009790 A009791 A009792
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KEYWORD
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sign,easy
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AUTHOR
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R. H. Hardin
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EXTENSIONS
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Extended with signs by Olivier Gérard, Mar 15 1997
Definition (Name) clarified by and prior Mathematica program replaced by Harvey P. Dale, Mar 05 2016
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STATUS
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approved
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