%I #3 Mar 31 2012 12:35:43
%S 180,516180,2626916040,17268436078740,131319696504676680,
%T 1097239851330486263400,9792481437399343532438160,
%U 91756879673807945288868127380
%N Number of permutations of n copies of 1..6 with all adjacent differences <= 3 in absolute value.
%K nonn
%O 1,1
%A _R. H. Hardin_ May 06 2010