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Number of permutations of 6 copies of 1..n with all adjacent differences <= 3 in absolute value.
0

%I #6 Mar 02 2016 11:17:08

%S 1,1,924,17153136,2308743493056,71614356453896256,

%T 1097239851330486263400

%N Number of permutations of 6 copies of 1..n with all adjacent differences <= 3 in absolute value.

%C a(n) = (6n)!/720^n for n<=4.

%Y Cf. A248814.

%K nonn

%O 0,3

%A _R. H. Hardin_, May 06 2010