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%I #6 Jun 20 2022 01:25:03
%S 62,926,13260,183422,2455350,31925284,404043442,4993740182,60359720132
%N Number of (n+1) X (n+1) 0..3 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant-stress 1 X 1 tilings).
%e Some solutions for n=4:
%e 2 1 2 2 3 0 3 3 0 3 0 3 3 3 1 2 3 3 0 2
%e 2 3 2 0 3 2 3 1 0 1 0 1 3 1 1 1 0 2 1 1
%e 1 0 1 1 2 1 0 0 1 0 2 1 1 1 3 1 2 2 3 1
%e 2 3 2 0 3 2 3 1 0 1 0 1 3 1 1 0 3 1 0 0
%e 2 1 2 2 3 1 0 0 1 0 1 0 0 0 2 0 1 1 2 0
%Y Diagonal of A234490.
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 26 2013
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