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A187630
Number of (n+1)X(n+1) 0..2 arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular
0
31, 446, 1648, 557382, 672698, 21411605018, 22329564088
OFFSET
1,1
COMMENTS
Column 2 of A187633
EXAMPLE
Some solutions for 4X4
..2..0..0..2....2..1..2..0....1..1..1..0....1..2..2..1....0..1..2..1
..1..1..1..0....2..0..0..1....2..0..0..2....2..2..2..2....2..0..0..1
..2..2..2..0....1..0..0..1....2..0..0..1....2..2..2..2....1..0..0..1
..1..0..0..1....2..2..2..2....1..1..2..0....1..2..2..1....1..2..2..1
CROSSREFS
Sequence in context: A332909 A084234 A187622 * A118196 A160443 A125466
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 12 2011
STATUS
approved