A187708 Number of 5X5 0..n arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal.

34, 5030, 81456, 875696, 4225652, 22532156, 67940472, 225606354, 577091334, 1469652502

Offset: 1

Author

R. H. Hardin Mar 12 2011

Keywords

• nonn

Comments

Row 4 of A187705

Examples

			Some n=3 solutions for 5X5
..0..1..1..1..2....2..2..1..2..2....2..2..1..2..2....0..0..1..0..0
..0..1..2..1..2....1..1..0..2..2....1..1..2..1..1....1..3..0..3..3
..1..0..0..0..1....1..2..0..1..0....3..0..0..0..3....0..3..0..3..2
..1..1..1..1..0....2..2..0..1..1....1..1..2..1..0....1..3..0..3..3
..2..2..1..2..0....0..0..1..3..3....3..3..3..3..0....0..0..1..2..2