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A053195
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Number of level permutations of degree n.
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3
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1, 2, 3, 18, 45, 360, 1575, 20790, 99225, 1332450, 9823275, 181496700, 1404728325, 26221595400, 273922023375, 7196040101250, 69850115960625, 1662139682453250, 22561587455281875, 675158520854317500
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| A permutation is level if the powers of 2 dividing its cycle lengths are all equal.
For odd n, level permutations of degree n are just permutations that have odd order, i.e., A053195(2*n+1) = A000246(2*n+1). - Vladeta Jovovic, Sep 29 2004
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LINKS
| L. Babai and P. J. Cameron, Automorphisms and enumeration of switching classes of tournaments, Electron. J. Combin., 7 (2000), no. 1, Research Paper 38, 25 pp.
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CROSSREFS
| Cf. A049313, A053197.
Sequence in context: A163910 A064777 A137784 * A003693 A048047 A114165
Adjacent sequences: A053192 A053193 A053194 * A053196 A053197 A053198
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KEYWORD
| nonn,nice
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AUTHOR
| Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 02 2000
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