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%I #5 Dec 18 2015 18:18:13
%S 1,1,15,602,2387217,33093356640,148049909203591059
%N Number of diagonal and antidiagonal neighbor colorings of the even squares of an n X n array with new integer colors introduced in row major order
%C Diagonal of A215904
%e Some solutions for n=3
%e ..0..x..0....0..x..0....0..x..0....0..x..1....0..x..1....0..x..1....0..x..1
%e ..x..1..x....x..1..x....x..1..x....x..2..x....x..2..x....x..2..x....x..2..x
%e ..2..x..2....2..x..0....2..x..3....1..x..3....3..x..3....0..x..0....1..x..0
%K nonn
%O 1,3
%A _R. H. Hardin_ Aug 26 2012
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