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A065088
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A000166(n)*binomial(n,2).
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0
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0, 0, 1, 6, 54, 440, 3975, 38934, 415324, 4805856, 60073245, 807651350, 11630179506, 178681848696, 2918470195459, 50511984152070, 923647710209400, 17795612550034304, 360361154138194809, 7652375096699313126, 170052779926651402990, 3947014523560698353400
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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MAPLE
| with (combstruct):with (combinat):a:=proc(m) [ZL, {ZL=Set(Cycle(Z, card>=m))}, labeled]; end: ZLL:=a(2):seq(count(ZLL, size=n)*binomial(n, 2), n=0..21); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 11 2008
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MATHEMATICA
| Table[Subfactorial[n]*Binomial[n, 2], {n, 0, 22}] [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jul 09 2009]
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CROSSREFS
| Cf. A000387.
Sequence in context: A060774 A043026 A125837 * A177484 A092810 A092472
Adjacent sequences: A065085 A065086 A065087 * A065089 A065090 A065091
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Nov 10 2001
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