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A024280
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Expansion of tanh(tan(x)^2)/2.
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0
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0, 1, 8, 16, -9472, -1073024, -73802752, 6179501056, 4687080685568, 1381417658515456, 171579748064165888, -115606987957684404224, -118208590165253073928192, -59168959906143078642089984
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Tanh[Tan[x]^2]/2, {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Dec 31 2014 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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EXTENSIONS
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Extended with signs Mar 1997
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STATUS
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approved
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