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A234815
Number of (n+1) X (n+1) 0..6 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 6 (constant-stress 1 X 1 tilings).
0
168, 2220, 15224, 129384, 747192, 5441232, 29871848, 201644928, 1092396888, 7078853280
OFFSET
1,1
EXAMPLE
Some solutions for n=4:
4 4 5 4 6 3 5 3 4 3 4 6 2 6 6 4 2 5 3 4
0 6 1 6 2 5 1 5 0 5 4 0 2 0 6 0 4 1 5 0
2 2 3 2 4 4 6 4 5 4 4 6 2 6 6 3 1 4 2 3
0 6 1 6 2 5 1 5 0 5 4 0 2 0 6 0 4 1 5 0
4 4 5 4 6 3 5 3 4 3 2 4 0 4 4 5 3 6 4 5
CROSSREFS
Diagonal of A234823.
Sequence in context: A235926 A279725 A234730 * A232274 A110075 A360623
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 31 2013
STATUS
approved