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A004205
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Number of permutations of length n with spread 1.
(Formerly M2753)
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1
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1, 3, 8, 25, 108, 735, 4608, 40824, 362000, 3628185, 40766976, 478988081, 6227101888, 87146087625, 1300561920000, 20922788404479, 355737629952000, 6402373698206889, 121810906419200000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,2
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REFERENCES
| Graham, R. L.; Lehmer, D. H. On the permanent of Schur's matrix. J. Austral. Math. Soc. Ser. A 21 (1976), no. 4, 487-497.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| Graham, R. L.; Lehmer, D. H., On the Permanent of Schur's Matrix, Jour. Australian Math. Soc. 21 (series A) (1976), 487-497.
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CROSSREFS
| Sequence in context: A012408 A184325 A051403 * A097713 A009392 A130648
Adjacent sequences: A004202 A004203 A004204 * A004206 A004207 A004208
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), May 17 2007
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