A187704 Number of (n+1)X(n+1) 0..5 arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal.

170, 93476, 2904, 4225652, 12898

Offset: 1

Author

R. H. Hardin Mar 12 2011

Keywords

• nonn

Comments

Column 5 of A187705

Examples

			Some solutions for 4X4
..3..2..0..0....0..0..1..0....2..2..4..0....1..1..0..0....2..2..4..0
..3..2..2..4....3..2..1..0....5..5..5..0....1..1..2..4....2..2..2..0
..5..2..2..2....2..2..1..2....0..2..2..2....3..1..2..3....0..2..2..2
..0..0..2..2....4..4..1..2....0..5..0..0....0..0..2..3....0..4..2..2