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A033305
Number of permutations (p1,...,pn) such that 1<=|pk-k|<=2 for all k.
+0
1
1, 0, 1, 2, 4, 6, 13, 24, 45, 84, 160, 300, 565, 1064, 2005, 3774, 7108, 13386, 25209, 47472, 89401, 168360, 317056, 597080, 1124425, 2117520, 3987721, 7509690, 14142276, 26632782, 50154949, 94451976, 177872293
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Maintained by
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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.
AT&T Labs Research
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