login
Number of (n+1) X (n+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 7 (constant-stress 1 X 1 tilings).
0

%I #7 Jun 20 2022 19:01:11

%S 240,3976,33560,357208,2557656,23137720,157274648,1310504248,

%T 8760624600

%N Number of (n+1) X (n+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 7 (constant-stress 1 X 1 tilings).

%e Some solutions for n=3:

%e 1 6 3 7 4 0 6 0 2 5 0 3 5 1 7 2 0 5 3 3

%e 3 1 5 2 1 4 3 4 6 2 4 0 1 4 3 5 4 2 7 0

%e 0 5 2 6 5 1 7 1 4 7 2 5 5 1 7 2 1 6 4 4

%e 2 0 4 1 1 4 3 4 7 3 5 1 2 5 4 6 4 2 7 0

%Y Diagonal of A234728.

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 30 2013