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Search: id:A002085
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| A002085 |
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Expansion of sinh x / cos x.
(Formerly M4620 N1973)
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+0
1
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| 1, 1, 9, 39, 1141, 12721, 804309, 17113719, 1886573641, 65373260641, 11127809595009, 570506317184199, 138730500808639741, 9867549661639871761
(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).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
Gandhi, J. M.; The coefficients of sinh x/ cos x. Canad. Math. Bull. 13 1970 305-310.
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..50
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FORMULA
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Divide A002084(n) by 4^(floor((n+1)/4)).
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CROSSREFS
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Cf. A002084.
Sequence in context: A126396 A075210 A146187 this_sequence A076603 A003354 A063164
Adjacent sequences: A002082 A002083 A002084 this_sequence A002086 A002087 A002088
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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