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A005802
Number of permutations in S_n with longest increasing subsequence of length <= 3 (i.e. 1234-avoiding permutations); vexillary permutations (i.e. 2143-avoiding).
(Formerly M1666)
+0
8
1, 1, 2, 6, 23, 103, 513, 2761, 15767, 94359, 586590, 3763290, 24792705, 167078577, 1148208090, 8026793118, 56963722223, 409687815151, 2981863943718, 21937062144834, 162958355218089, 1221225517285209, 9225729232653663
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 17 19:39 EST 2009. Contains 170821 sequences.
AT&T Labs Research
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