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Search: id:A094792
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| 2, 11, 32, 71, 134, 227, 356, 527, 746, 1019, 1352, 1751, 2222, 2771, 3404, 4127, 4946, 5867, 6896, 8039, 9302, 10691, 12212, 13871, 15674, 17627, 19736, 22007, 24446, 27059, 29852, 32831, 36002, 39371, 42944, 46727, 50726, 54947, 59396, 64079
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OFFSET
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0,1
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COMMENT
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Number of injections from {1,2,3} to {1,2,...,n} with no fixed points. - Fiona T. Brunk (fbrunk(AT)mcs.st-and.ac.uk), May 23 2006
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LINKS
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Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets
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FORMULA
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a(n)=n^3 + 3*n^2 + 5*n + 2
a(n) = sum((-1)^i*binomial(3,i)*(n-i)!/(n-3)!,i=0..3) - Fiona T. Brunk (fbrunk(AT)mcs.st-and.ac.uk), May 23 2006
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MAPLE
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with(combinat):seq(fibonacci(4, i)-1, i=1..40); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 20 2008
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CROSSREFS
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Cf. A001563, A001564, A001565, A001688, A001689, A023043.
Sequence in context: A000755 A033994 A023659 this_sequence A031400 A085786 A034128
Adjacent sequences: A094789 A094790 A094791 this_sequence A094793 A094794 A094795
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KEYWORD
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nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 11 2004
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