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A198721 Number of nX6 0..6 arrays with values 0..6 introduced in row major order and no element equal to any horizontal or vertical neighbor.

%I A198721 #7 Jul 22 2025 13:06:16
%S A198721 52,272410,5315840795,116492275674072,2572072097029554676,
%T A198721 56817439251356046537693,1255145613308486512244031328,
%U A198721 27727293796669883715931085888092,612520905593913038338760996059873808
%N A198721 Number of nX6 0..6 arrays with values 0..6 introduced in row major order and no element equal to any horizontal or vertical neighbor.
%C A198721 Column 6 of A198723
%H A198721 R. H. Hardin, <a href="/A198721/b198721.txt">Table of n, a(n) for n = 1..11</a>
%e A198721 Some solutions with all values 0 to 6 for n=3
%e A198721 ..0..1..2..3..4..2....0..1..2..1..2..3....0..1..2..3..4..2....0..1..0..2..3..0
%e A198721 ..1..0..1..2..3..5....1..0..1..4..3..5....1..0..1..2..1..3....1..0..1..3..4..2
%e A198721 ..0..1..0..1..6..0....0..1..0..6..5..4....0..1..0..5..6..4....0..1..3..4..5..6
%K A198721 nonn
%O A198721 1,1
%A A198721 _R. H. Hardin_ Oct 29 2011