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%I #7 Jun 20 2022 19:08:06
%S 630,6706,72616,790718,8612920,93934380,1023822944,11170450750,
%T 121790634482,1329240620840,14497107132750,158275185584352,
%U 1726726741846356,18858007382510560,205796722132646470
%N Number of (n+1) X (1+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant-stress 1 X 1 tilings).
%H R. H. Hardin, <a href="/A234241/b234241.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 7*a(n-1) +181*a(n-2) -1022*a(n-3) -7657*a(n-4) +21504*a(n-5) +54144*a(n-6) -96768*a(n-7) -80640*a(n-8).
%e Some solutions for n=3:
%e 5 1 0 3 4 1 4 2 1 0 2 6 2 3 4 1 3 0 2 7
%e 7 5 2 3 2 1 3 3 7 4 3 5 7 6 7 6 5 4 2 5
%e 1 1 6 5 4 5 0 2 7 2 3 3 0 1 5 2 3 4 0 1
%e 5 7 4 5 1 4 5 5 5 2 3 1 1 4 1 0 0 3 5 4
%Y Column 1 of A234245.
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 21 2013
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