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A215902 Number of diagonal and antidiagonal neighbor colorings of the even squares of an nX6 array with new integer colors introduced in row major order.

%I A215902 #6 Jul 22 2025 23:27:22
%S A215902 5,52,2906,373780,87852626,33093356640,18383354944364,
%T A215902 14216420563705724,14670987605491079080,19558496206477343793824,
%U A215902 32828323775130245290328888,67939294184937980415465539016,170381709311721603692658697682568
%N A215902 Number of diagonal and antidiagonal neighbor colorings of the even squares of an nX6 array with new integer colors introduced in row major order.
%C A215902 Column 6 of A215904
%H A215902 R. H. Hardin, <a href="/A215902/b215902.txt">Table of n, a(n) for n = 1..15</a>
%e A215902 Some solutions for n=3
%e A215902 ..0..x..1..x..1..x....0..x..1..x..2..x....0..x..1..x..2..x....0..x..1..x..2..x
%e A215902 ..x..2..x..3..x..2....x..3..x..3..x..1....x..3..x..3..x..4....x..3..x..0..x..4
%e A215902 ..4..x..5..x..4..x....2..x..2..x..4..x....1..x..1..x..2..x....2..x..5..x..2..x
%K A215902 nonn
%O A215902 1,1
%A A215902 _R. H. Hardin_ Aug 26 2012