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Search: id:A003721
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| A003721 |
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Expansion of tan(tanh(x)).
(Formerly M4571)
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+0
1
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| 1, 0, -8, 112, -128, -109824, 8141824, -353878016, -9666461696, 5151942574080, -825073851170816, 76429076694827008, 2051308253366714368, -2361338488910424047616, 171581865952588387581952
(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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Tan[ Tanh[ x ] ] (* Odd Part *)
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CROSSREFS
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Sequence in context: A144813 A079660 A131621 this_sequence A075851 A053536 A139741
Adjacent sequences: A003718 A003719 A003720 this_sequence A003722 A003723 A003724
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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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