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%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