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Search: id:A070315
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| 1, 21, 161, 813, 3361, 12421, 42865, 141549, 453905, 1426725, 4422913, 13579309, 41408833, 125667333, 380081105, 1146795693, 3454279345, 10392196645, 31238454241, 93845384301, 281808780641, 845996765061, 2539181475121
(list; graph; listen)
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OFFSET
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4,2
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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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3^n - (3n+2)2^(n-1) + 2n^2. - R. Stephan, May 09 2004
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CROSSREFS
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Sequence in context: A041850 A078396 A108675 this_sequence A126993 A022681 A107970
Adjacent sequences: A070312 A070313 A070314 this_sequence A070316 A070317 A070318
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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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EXTENSIONS
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More terms from Larry Reeves (larryr(AT)acm.org), Oct 01 2002
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