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A009094
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E.g.f. cos(tanh(x)*tan(x)) (only powers that are multiples of 4).
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0
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1, -12, -4592, -6274752, 18138366208, 2332645761266688, 202540305420145266688, 24977439274944176331767808, 4480212151308993274762821173248, 1107507319145672023044777103840247808, 336310686770623540666061200154740824997888
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..10.
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MATHEMATICA
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With[{nn=60}, Select[CoefficientList[Series[Cos[Tanh[x]Tan[x]], {x, 0, nn}], x]Range[0, nn]!, #!=0&]] (* Harvey P. Dale, Dec 28 2012 *)
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CROSSREFS
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Sequence in context: A096732 A127233 A169657 * A061701 A134821 A013508
Adjacent sequences: A009091 A009092 A009093 * A009095 A009096 A009097
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KEYWORD
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sign
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AUTHOR
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R. H. Hardin
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EXTENSIONS
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Extended with signs Mar 15 1997 by Olivier Gerard
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STATUS
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approved
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