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A000352
One half of the number of permutations of [n] such that the differences have three runs with the same signs.
(Formerly M3954 N1629)
+0
4
5, 29, 118, 418, 1383, 4407, 13736, 42236, 128761, 390385, 1179354, 3554454, 10696139, 32153963, 96592972, 290041072, 870647517, 2612991141, 7841070590, 23527406090, 70590606895, 211788597919, 635399348208, 1906265153508
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 4 08:07 EST 2009. Contains 170310 sequences.
AT&T Labs Research
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