A266468 Number of nX6 binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing.

2, 8, 39, 261, 2090, 18808, 175180, 1595005, 13720886, 109830369, 814603355, 5605474331, 35922351069, 215377645103, 1213816837380, 6458765687442, 32580784869691, 156385330035183, 716642920656832

Offset: 1

Author

R. H. Hardin, Dec 29 2015

Keywords

• nonn

Comments

Column 6 of A266470.

Examples

			Some solutions for n=4
..0..0..0..0..0..1....0..0..0..1..1..1....0..0..0..0..0..1....0..1..1..1..1..1
..0..0..0..0..1..0....1..1..1..0..0..0....0..0..1..1..1..0....1..0..0..1..1..1
..1..1..1..1..0..0....1..1..1..0..0..0....1..1..0..0..0..0....1..0..1..0..0..0
..1..1..1..1..1..1....1..1..1..0..0..0....1..1..1..1..1..0....1..1..0..0..0..0
		

Crossrefs

Cf. A266470.