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A234325
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 1 (constant-stress 1 X 1 tilings).
0
80, 3296, 287888, 53812604, 21167182224, 17748461638244, 31177141022942176, 116792004877640829552
OFFSET
1,1
EXAMPLE
Some solutions for n=2:
0 2 3 2 0 0 1 3 2 2 2 2 3 3 2 2 3 2 3 2 1
0 1 3 1 0 1 0 3 3 2 3 2 2 1 1 1 3 1 3 3 1
0 0 3 0 0 0 1 3 2 3 3 1 3 1 2 0 3 0 3 2 1
CROSSREFS
Diagonal of A234333.
Sequence in context: A035735 A035805 A017743 * A196280 A286789 A264372
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 23 2013
STATUS
approved