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A234482
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).
0
62, 926, 13260, 183422, 2455350, 31925284, 404043442, 4993740182, 60359720132
OFFSET
1,1
EXAMPLE
Some solutions for n=4:
2 1 2 2 3 0 3 3 0 3 0 3 3 3 1 2 3 3 0 2
2 3 2 0 3 2 3 1 0 1 0 1 3 1 1 1 0 2 1 1
1 0 1 1 2 1 0 0 1 0 2 1 1 1 3 1 2 2 3 1
2 3 2 0 3 2 3 1 0 1 0 1 3 1 1 0 3 1 0 0
2 1 2 2 3 1 0 0 1 0 1 0 0 0 2 0 1 1 2 0
CROSSREFS
Diagonal of A234490.
Sequence in context: A196413 A131473 A138408 * A157499 A249235 A250564
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 26 2013
STATUS
approved