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A234258
Number of (n+1) X (n+1) 0..2 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
20, 88, 292, 988, 3188, 11140, 39508, 147892, 562580, 2191828, 8605972, 34091668, 135464468, 539959060, 2154718228, 8607898132
OFFSET
1,1
EXAMPLE
Some solutions for n=5:
0 1 0 2 0 2 2 2 2 2 0 2 0 1 0 1 1 1 2 0 0 0 2 2
2 1 2 2 2 2 0 2 0 2 2 2 1 0 1 0 2 0 2 2 0 2 2 0
0 1 0 2 0 2 2 2 2 2 0 2 0 1 0 1 1 1 2 0 0 0 2 2
2 1 2 2 2 2 0 2 0 2 2 2 1 0 1 0 2 0 2 2 0 2 2 0
0 1 0 2 0 2 2 2 2 2 0 2 0 1 0 1 1 1 2 0 0 0 2 2
1 0 1 1 1 1 2 0 2 0 0 0 1 0 1 0 2 0 2 2 0 2 2 0
CROSSREFS
Diagonal of A234266.
Sequence in context: A339343 A306987 A249983 * A213839 A264302 A220200
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 22 2013
STATUS
approved