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Search: id:A065340
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| 2, 28, 182, 864, 3474, 12660, 43358, 142552, 455930, 1430796, 4431078, 13595664, 41441570, 125732836, 380212142, 1147057800, 3454803594, 10393245180, 31240551350, 93849578560, 281817169202, 846013542228, 2539215029502
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OFFSET
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4,1
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REFERENCES
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D. P. Roselle, Permutations by number of rises and successions, Proc. Amer. Math. Soc., 19 (1968), 8-16.
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FORMULA
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a(n) = 3^n-(3*n+1)*2^(n-1)+2*n^2-2*n+1. - Vladeta Jovovic (vladeta(AT)Eunet.yu), Jan 04 2003
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CROSSREFS
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Sequence in context: A123807 A110241 A006332 this_sequence A001798 A123787 A035601
Adjacent sequences: A065337 A065338 A065339 this_sequence A065341 A065342 A065343
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KEYWORD
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nonn,easy
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AUTHOR
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njas, May 15 2002
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