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%I #4 Mar 31 2012 12:35:42
%S 12,660,51240,4635540,457507512,47768769048,5188083048720,
%T 580132098966420,66341857216154520,7722843117550721160,
%U 912113857017595941072,109025503164832356811800
%N Number of permutations of n copies of 1..4 with all adjacent differences <= 2 in absolute value.
%H R. H. Hardin, <a href="/A177322/b177322.txt">Table of n, a(n) for n=1..35</a>
%K nonn
%O 1,1
%A _R. H. Hardin_ May 06 2010
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