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A009387
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Expansion of log(1+tanh(tanh(x))).
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1
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0, 1, -1, -2, 10, 16, -232, -272, 10064, 7936, -720384, -353792, 78009600, 22368256, -11977120768, -1903757312, 2480763381760, 209865342976, -666957211828224, -29088885112832, 225809770695098368, 4951498053124096
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OFFSET
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0,4
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LINKS
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MATHEMATICA
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With[{nn=30}, CoefficientList[Series[Log[1+ Tanh[ Tanh[x]]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Aug 08 2012 *)
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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