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Search: id:A052768
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| 0, 0, 0, 0, 0, 120, 360, 840, 1680, 3024, 5040, 7920, 11880, 17160, 24024, 32760, 43680, 57120, 73440, 93024, 116280, 143640, 175560, 212520, 255024, 303600, 358800, 421200, 491400, 570024, 657720, 755160, 863040, 982080, 1113024
(list; graph; listen)
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OFFSET
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0,6
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LINKS
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INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 725
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FORMULA
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a(n)=0, n <= 4; a(n) = n*(n-1)*(n-2)*(n-3), n >= 5.
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MAPLE
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spec := [S, {B=Set(Z, 1 <= card), S=Prod(Z, Z, Z, Z, B)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Adjacent sequences: A052765 A052766 A052767 this_sequence A052769 A052770 A052771
Sequence in context: A098114 A135805 A118058 this_sequence A061218 A052778 A033697
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KEYWORD
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easy,nonn
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AUTHOR
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encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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EXTENSIONS
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More terms and corrected formula from Larry Reeves (larryr(AT)acm.org), Jan 23 2001
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