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A001268 One-half the number of permutations of length n with exactly 4 rising or falling successions.
(Formerly M4805 N2053)
+0
5
0, 0, 0, 0, 0, 1, 11, 113, 1099, 11060, 118484, 1366134, 16970322, 226574211, 3240161105, 49453685911, 802790789101, 13815657556958, 251309386257874, 4818622686395380, 97145520138758844, 2054507019515346789, 45484006970415223287, 1052036480881734378541 (list; graph; listen)
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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.


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