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A206120
Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having nonzero determinant and having the same number of clockwise edge increases as its horizontal and vertical neighbors
0
50, 798, 25340, 2501248, 619611200, 372768662926, 529835514016558, 1784953478369789594, 14217384542781343057074, 268389362522364377038143786
OFFSET
1,1
COMMENTS
Diagonal of A206128
EXAMPLE
Some solutions for n=4
..0..1..2..0..2....1..2..1..1..1....2..2..2..1..0....2..1..2..1..1
..1..2..0..1..0....1..1..1..0..1....1..2..1..1..2....1..2..1..0..2
..0..1..2..2..1....1..2..1..1..1....1..1..1..2..2....1..0..2..1..0
..2..0..1..0..2....2..2..2..1..2....2..1..2..2..1....2..1..0..2..1
..1..1..0..1..0....0..1..2..2..2....1..1..1..2..2....0..2..1..0..2
CROSSREFS
Sequence in context: A223982 A128799 A231835 * A160287 A104672 A086027
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 04 2012
STATUS
approved