A187523 Number of 4X4 0..n arrays with the array of 2X2 subblock determinants antisymmetric and no off-diagonal 2X2 subblock determinant zero.

2, 354, 4200, 34776, 107990, 475370, 978568, 2790760, 5647886, 11787078, 17703910, 41527872, 57261832

Offset: 1

Author

R. H. Hardin Mar 10 2011

Keywords

• nonn

Comments

Row 3 of A187521

Examples

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