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Search: id:A061129
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| A061129 |
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Number of degree-n even permutations of order dividing 4. |
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12
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| 1, 1, 1, 1, 4, 16, 136, 736, 4096, 20224, 99856, 475696, 3889216, 31778176, 313696384, 2709911296, 23006784256, 179965340416, 1532217039616, 13081112406784, 147235213351936, 1657791879049216, 20132199908571136
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OFFSET
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0,5
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FORMULA
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E.g.f.: 1/2*exp(x + 1/2*x^2 + 1/4*x^4) + 1/2*exp(x - 1/2*x^2 - 1/4*x^4).
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CROSSREFS
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Cf. A000085, A001470, A001472, A052501, A053496 - A053505, A001189, A001471, A001473, A061121 - A061128, A000704, A061129 - A061132, A048099, A051695, A061133 - A061135.
Sequence in context: A071554 A087335 A094356 this_sequence A061131 A136651 A005749
Adjacent sequences: A061126 A061127 A061128 this_sequence A061130 A061131 A061132
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KEYWORD
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easy,nonn
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AUTHOR
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Vladeta Jovovic (vladeta(AT)Eunet.yu), Apr 14 2001
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