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A001267 One-half the number of permutations of length n with exactly 3 rising or falling successions.
(Formerly M4550 N1934)
+0
8
0, 0, 0, 0, 1, 8, 60, 444, 3599, 32484, 325322, 3582600, 43029621, 559774736, 7841128936, 117668021988, 1883347579515, 32026067455084, 576605574327174, 10957672400252944, 219190037987444577, 4603645435776504120, 101292568208941883236, 2329975164242735146316 (list; graph; listen)
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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.


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