A188418 Number of (3*n)Xn binary arrays with rows in nonincreasing order, 3 ones in every column and no more than 3 ones in any row.

1, 4, 39, 723, 21965, 968230, 57967660, 4505774905, 439923593145, 52601045792520

Offset: 1

Author

R. H. Hardin Mar 30 2011

Keywords

• nonn

Comments

Row 3 of A188416

Examples

			All solutions for 6X2
..1..0....1..1....1..1....1..1
..1..0....1..1....1..0....1..1
..1..0....1..0....1..0....1..1
..0..1....0..1....0..1....0..0
..0..1....0..0....0..1....0..0
..0..1....0..0....0..0....0..0