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A187622
Number of (n+1)X(n+1) 0..2 arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation
0
31, 446, 60, 324452, 70548, 6090023738, 720252796
OFFSET
1,1
COMMENTS
Column 2 of A187624
EXAMPLE
Some solutions for 4X4
..1..2..0..2....2..2..0..2....1..1..2..1....1..2..1..1....2..0..1..2
..0..2..1..2....0..2..2..2....2..1..1..1....1..1..1..2....1..2..2..0
..1..2..1..0....2..2..2..0....1..1..1..2....2..1..1..1....0..2..2..1
..1..0..1..2....2..0..2..2....1..2..1..1....1..1..2..1....2..1..0..2
CROSSREFS
Sequence in context: A022723 A332909 A084234 * A187630 A118196 A160443
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 12 2011
STATUS
approved