A187518 Number of (n+1)X(n+1) 0..3 arrays with the array of 2X2 subblock determinants antisymmetric and no off-diagonal 2X2 subblock determinant zero.

64, 450, 4200, 73764, 2048596, 129034386, 13881494364

Offset: 1

Author

R. H. Hardin Mar 10 2011

Keywords

• nonn

Comments

Column 3 of A187521

Examples

			Some solutions for 4X4
..0..0..1..0....0..1..0..1....2..2..2..3....3..2..3..3....2..2..3..2
..2..2..2..1....0..3..3..2....2..2..1..0....3..2..1..3....2..2..1..2
..2..3..3..3....1..1..1..1....1..2..1..3....1..2..1..1....0..2..1..1
..1..1..0..0....0..3..2..2....0..3..0..0....3..0..1..1....2..3..2..2