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Search: id:A000483
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| A000483 |
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Associated Stirling numbers: second order reciprocal Stirling numbers (Fekete) [[n \over 3]]. The number of 3-orbit permutations of an n-set with at least 2 elements in each orbit.
(Formerly M4988 N2145)
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+0
6
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| 15, 210, 2380, 26432, 303660, 3678840, 47324376, 647536032, 9418945536, 145410580224, 2377609752960, 41082721413120, 748459539843840, 14345340443665920, 288650580508961280, 6085390148673177600
(list; graph; listen)
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OFFSET
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6,1
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REFERENCES
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L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 256.
A. E. Fekete, Apropos two notes on notation, Amer. Math. Monthly, 101 (1994), 771-778.
J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 75.
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FORMULA
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With alternating signs: Ramanujan polynomials psi_4(n-3, x) evaluated at 1. - Ralf Stephan, Apr 16 2004
E.g.f.: -((x+ln(1-x))^3)/6. - Vladeta Jovovic (vladeta(AT)Eunet.yu), May 03 2008
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CROSSREFS
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Cf. A000907, A001784, A001785. A diagonal of triangle in A008306.
Cf. A000276.
Sequence in context: A067560 A019553 A112496 this_sequence A076139 A001880 A113362
Adjacent sequences: A000480 A000481 A000482 this_sequence A000484 A000485 A000486
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KEYWORD
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nonn
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AUTHOR
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njas
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EXTENSIONS
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More terms from Barbara Haas Margolius (margolius(AT)math.csuohio.edu), Dec 14 2000
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