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 A009789 Expansion of e.g.f.: tanh(log(1+x)^2). 2
 0, 0, 2, -6, 22, -100, 308, 1512, -51144, 869472, -12648528, 168624720, -2029008720, 19500193440, -52358834400, -4526884091520, 184448883292800, -5247799551052800, 128265498107293440, -2787299439278250240 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS EXAMPLE tanh(log(x+1)^2) = 2/2!*x^2-6/3!*x^3+22/4!*x^4-100/5!*x^5... MATHEMATICA With[{nn=20}, CoefficientList[Series[Tanh[Log[1+x]^2], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Mar 05 2016 *) CROSSREFS Sequence in context: A318974 A012269 A012272 * A012271 A012266 A009468 Adjacent sequences:  A009786 A009787 A009788 * A009790 A009791 A009792 KEYWORD sign,easy AUTHOR EXTENSIONS 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 STATUS approved

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Last modified January 26 06:32 EST 2021. Contains 340434 sequences. (Running on oeis4.)