The number of permutations p of {1,...,n} such that |p(i)-p(i+1)| is in {2,3,4,5} for all i from 1 to n-1.
1, 0, 0, 2, 14, 90, 462, 1668, 4496, 11332, 31718, 100258, 336142, 1123212
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Sun Nov 28 11:38:23 CET 2010 [seqfan] Re: Changing sequences without asking authors