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Search: id:A087639
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| A087639 |
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E.g.f.: Product_{m >= 1} (1+x^(2*m)/(2*m)). |
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+0
1
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| 1, 1, 6, 210, 8400, 740880, 88814880, 15217282080, 3319002086400, 992431440000000, 351841557779712000, 156995673442223616000, 82429416503416958976000, 52017974139195896832000000
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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Number of permutations of 2*n elements with distinct cycle lengths and without odd cycles. - Vladeta Jovovic (vladeta(AT)Eunet.yu), Aug 17 2004
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CROSSREFS
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Cf. A088994, A007838.
Sequence in context: A065945 A076715 A029549 this_sequence A028350 A099788 A126676
Adjacent sequences: A087636 A087637 A087638 this_sequence A087640 A087641 A087642
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KEYWORD
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nonn
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AUTHOR
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Yuval Dekel (dekelyuval(AT)hotmail.com), Nov 06 2003
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EXTENSIONS
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More terms from Christian G. Bower (bowerc(AT)usa.net), Jan 06 2006
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