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Search: id:A003711
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| A003711 |
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Expansion of cos(tanh(x)).
(Formerly M4665)
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+0
2
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| 1, -1, 9, -177, 6097, -325249, 24807321, -2558036145, 342232522657, -57569080467073, 11879658510739497, -2948163649552594737, 865683568087537789297, -296699416391356495667713, 117330699580950022391960505
(list; graph; listen)
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OFFSET
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0,3
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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MATHEMATICA
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Cos[ Tanh[ x ] ] (* Even Part *)
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CROSSREFS
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Sequence in context: A141359 A141363 A157774 this_sequence A009009 A034221 A034240
Adjacent sequences: A003708 A003709 A003710 this_sequence A003712 A003713 A003714
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KEYWORD
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sign
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AUTHOR
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R. H. Hardin (rhhardin(AT)att.net), Simon Plouffe (simon.plouffe(AT)gmail.com)
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