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Search: id:A001473
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| A001473 |
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Number of degree-n permutations of order exactly 4.
(Formerly M4206 N1756)
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+0
25
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| 0, 0, 0, 6, 30, 180, 840, 5460, 30996, 209160, 1290960, 9753480, 69618120, 571627056, 4443697440, 40027718640, 346953934320, 3369416698080, 31421601510336, 328430320909920, 3331475969159520, 37124416523261760
(list; graph; listen)
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OFFSET
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1,4
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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).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
L. Moser and M. Wyman, On solutions of x^d = 1 in symmetric groups, Canad. J. Math., 7 (1955), 159-168.
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FORMULA
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E.g.f.: -exp(x+1/2*x^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.
Adjacent sequences: A001470 A001471 A001472 this_sequence A001474 A001475 A001476
Sequence in context: A001341 A089896 A057754 this_sequence A063888 A029571 A109501
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com) and J. H. Conway (conway(AT)math.princeton.edu)
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EXTENSIONS
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More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 14 2001
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