A187702 Number of (n+1) X (n+1) 0..3 arrays with each 2 X 2 subblock off diagonal and antidiagonal nonsingular and the array of 2 X 2 subblock determinants antisymmetric about the diagonal and antidiagonal.

64, 8272, 322, 81456, 530, 230446

Offset: 1

Author

R. H. Hardin Mar 12 2011

Keywords

• nonn

Comments

Column 3 of A187705.

Examples

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

Crossrefs

Cf. A187705.