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Number of permutations of 6 copies of 1..n with all adjacent differences <= 2 in absolute value.
0

%I #5 Mar 02 2016 11:16:18

%S 1,1,924,17153136,47768769048,83659800759150,202929004783993742

%N Number of permutations of 6 copies of 1..n with all adjacent differences <= 2 in absolute value.

%C a(n) = (6n)!/720^n for n<=3.

%Y Cf. A248814.

%K nonn

%O 0,3

%A _R. H. Hardin_, May 06 2010