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A000349 One-half the number of permutations of length n with exactly 2 rising or falling successions.
(Formerly M3932 N1617)
+0
9
0, 0, 0, 1, 5, 24, 128, 835, 6423, 56410, 554306, 6016077, 71426225, 920484892, 12793635300, 190730117959, 3035659077083, 51371100102990, 920989078354838, 17437084517068465, 347647092476801301, 7280060180210901232, 159755491837445900120, 3665942433747225901707 (list; graph; listen)
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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.


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