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Search: id:A001755
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| A001755 |
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Lah numbers: n!C(n-1,3)/4!.
(Formerly M5096 N2207)
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+0
4
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| 1, 20, 300, 4200, 58800, 846720, 12700800, 199584000, 3293136000, 57081024000, 1038874636800, 19833061248000, 396661224960000, 8299373322240000, 181400588328960000, 4135933413900288000, 98228418580131840000
(list; graph; listen)
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OFFSET
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4,2
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REFERENCES
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L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 156.
J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 44.
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FORMULA
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E.g.f.: ((x/(1-x))^4)/4!.
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MAPLE
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A001755 := n-> n!*binomial(n-1, 3)/4!;
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CROSSREFS
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Column 4 of A008297. Cf. A053495.
Column m=4 of unsigned triangle A111596.
Sequence in context: A077758 A053541 A004345 this_sequence A016190 A016188 A006300
Adjacent sequences: A001752 A001753 A001754 this_sequence A001756 A001757 A001758
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KEYWORD
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nonn,easy
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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) 2/12/01
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