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Search: id:A013299
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| A013299 |
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sinh(log(x+1)-arctanh(x))=-1/2!*x^2-6/4!*x^4-135/6!*x^6-6300/8!*x^8... |
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+0
2
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| 1, 6, 135, 6300, 496125, 58939650, 9833098275, 2191376187000, 628651043645625, 225615874552818750, 99022807341232149375, 52176017395434685252500, 32501310835906189355203125
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Number of degree-2n permutations without odd cycles and with odd number of even cycles, offset 1. E.g.f.: x^2/(2*sqrt(1-x^2)). - Vladeta Jovovic (vladeta(AT)eunet.rs), Aug 10 2007
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CROSSREFS
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Cf. A013302.
Sequence in context: A129047 A050281 A096756 this_sequence A013295 A090407 A075185
Adjacent sequences: A013296 A013297 A013298 this_sequence A013300 A013301 A013302
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KEYWORD
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nonn
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AUTHOR
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Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)
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