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A207141
Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor
0
50, 48, 157, 190, 622, 754, 2482, 3010, 9922, 12034, 39682, 48130, 158722, 192514, 634882, 770050, 2539522, 3080194, 10158082, 12320770, 40632322, 49283074, 162529282, 197132290
OFFSET
1,1
COMMENTS
Diagonal of A207149
EXAMPLE
Some solutions for n=4
..2..1..0..1..0....1..1..0..1..0....2..2..0..1..0....0..2..0..1..0
..1..0..1..0..1....1..0..1..0..1....1..0..2..0..1....1..0..2..0..1
..0..1..0..1..0....0..1..0..1..0....0..1..0..2..0....0..1..0..2..0
..2..0..1..0..1....1..0..1..0..1....1..0..1..0..2....1..0..1..0..2
..0..2..0..1..2....0..1..0..1..0....0..1..0..1..1....0..1..0..1..2
CROSSREFS
Sequence in context: A244277 A248688 A291495 * A256958 A165871 A171652
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 15 2012
STATUS
approved