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Search: id:A003712
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| A003712 |
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Expansion of sin(sin(x)); unsigned sequence come from expansion of sinh(sinh(x)).
(Formerly M2042)
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+0
1
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| 1, -2, 12, -128, 1872, -37600, 990784, -32333824, 1272660224, -59527313920, 3252626013184, -204354574172160, 14594815769038848, -1174376539738169344, 105595092426069327872, -10530693390637550272512
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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|a(n)| is the number of partitions of the set {1, 2, ..., 2n-1} into an odd number of blocks, each containing an odd number of elements. - Isabel C. Lugo (izzycat(AT)gmail.com), Aug 23 2004
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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).
L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 226, 6th line of table.
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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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MATHEMATICA
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Sin[ Sin[ x ] ] (* Odd Part *)
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CROSSREFS
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Sequence in context: A013469 A039933 A035351 this_sequence A143136 A097629 A014235
Adjacent sequences: A003709 A003710 A003711 this_sequence A003713 A003714 A003715
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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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