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A009831
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E.g.f.: tanh(x)*exp(tanh(x)).
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0
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0, 1, 2, 1, -12, -39, 118, 1233, -536, -50831, -116246, 2696321, 16364252, -173033847, -2126232482, 12037460945, 306170653648, -631883857695, -50385573229614, -72323545938047, 9466502482856388, 51175586766916153
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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..21.
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MATHEMATICA
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With[{nn=30}, CoefficientList[Series[Tanh[x]*Exp[Tanh[x]], {x, 0, nn}], x]Range[0, nn]!] (* Harvey P. Dale, Jul 16 2012 *)
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CROSSREFS
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Sequence in context: A013157 A062742 A009821 * A012931 A013159 A012590
Adjacent sequences: A009828 A009829 A009830 * A009832 A009833 A009834
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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 Mar 15 1997 by Olivier Gerard.
Definition clarified by Harvey P. Dale, Jul 16 2012
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STATUS
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approved
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