A187629 Number of (n+1)X(n+1) 0..1 arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular.

10, 24, 24, 954, 954, 194008, 194008, 196196792, 196196792, 1031851558448, 1031851558448, 27419179198175312, 27419179198175312

Offset: 1

Author

R. H. Hardin Mar 12 2011

Keywords

• nonn

Comments

Column 1 of A187633

Examples

			Some solutions for 4X4
..0..1..1..0....1..0..0..1....1..0..0..1....0..1..1..1....1..1..1..0
..1..0..0..1....0..1..1..1....1..1..1..1....1..0..0..1....1..0..0..1
..1..0..0..1....0..1..1..1....1..1..1..1....1..0..0..1....1..0..0..1
..1..1..1..1....1..0..0..1....1..0..0..1....1..1..1..1....0..1..1..0