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A003719
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Expansion of tan(x)*cosh(x).
(Formerly M3996)
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4
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1, 5, 41, 685, 19921, 887765, 56126201, 4776869245, 526589630881, 72989204937125, 12424192360405961, 2547879762929443405, 619570064016825283441, 176273806836039238900085, 58010159408189457446855321, 21864887814006548202566779165
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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FORMULA
| a(n) = Sum_{k>=0} binomial(2n+1, 2k)*A000111(2n+1-2k) . - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Aug 27 2005
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MATHEMATICA
| Tan[ x ]*Cosh[ x ] (* Odd Part *)
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CROSSREFS
| Bisection of A009739 and (apparently) A062272.
Sequence in context: A100288 A076094 A076131 * A181033 A189997 A197173
Adjacent sequences: A003716 A003717 A003718 * A003720 A003721 A003722
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KEYWORD
| nonn
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net)
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EXTENSIONS
| Extended and formatted Mar 15 1997 by Olivier Gerard
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