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A099745
Number of permutations of [n] with exactly 2 valleys which avoid the permutation 1324.
+0
1
0, 0, 0, 0, 12, 168, 1409, 9187, 51362, 258674, 1207855, 5326205, 22459080, 91368900, 360977373, 1391835607, 5257593566, 19515948358, 71358739003, 257521313441, 918732810340, 3244576312440, 11355547678665, 39423281302875
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Maintained by
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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.
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