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A088921
The number of 321- 2143-avoiding permutations of length n.
+0
2
1, 2, 5, 13, 33, 80, 185, 411, 885, 1862, 3853, 7881, 15993, 32284, 64945, 130359, 261293, 523282, 1047397, 2095781, 4192721, 8386792, 16775145, 33552083, 67106213, 134214750, 268432125, 536867201, 1073737705, 2147479092
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 9 14:43 EST 2009. Contains 170430 sequences.
AT&T Labs Research
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