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%I #6 Jan 20 2020 10:51:13
%S 1,428,6068622,171548183912,6595449547140990,302061042944500510428,
%T 15490059482899736687180550
%N Number of permutations of n copies of 1..7 with all adjacent differences <= 3 in absolute value.
%K nonn
%O 0,2
%A _R. H. Hardin_, May 06 2010
%E a(0) and a(6) from _Alois P. Heinz_, Jan 20 2020
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