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A113226
Number of permutations avoiding the pattern 12-34.
+0
1
1, 2, 6, 23, 107, 585, 3669, 25932, 203768, 1761109, 16595757, 169287873, 1857903529, 21823488238, 273130320026, 3627845694283, 50962676849199, 754814462534449, 11754778469338581, 191998054346198680
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 5 08:23 EST 2009. Contains 170348 sequences.
AT&T Labs Research
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