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A003274 Number of key permutations of length n: permutations {a_i} with |a_i-a_{i-1}|=1 or 2.
(Formerly M1583)
+0
4
1, 2, 6, 12, 20, 34, 56, 88, 136, 208, 314, 470, 700, 1038, 1534, 2262, 3330, 4896, 7192, 10558, 15492, 22724, 33324, 48860, 71630, 105002, 153912, 225594, 330650, 484618, 710270, 1040980, 1525660, 2235994, 3277040, 4802768, 7038832 (list; graph; listen)
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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.


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