A267249 Number of 6Xn binary arrays with row sums nondecreasing and columns lexicographically nondecreasing.

7, 127, 1685, 20676, 220235, 2093467, 17892539, 139164323, 993947185, 6572368601, 40512935649, 234192144667, 1276154088792, 6584891361478, 32302298031855, 151176059240006

Offset: 1

Author

R. H. Hardin, Jan 12 2016

Keywords

• nonn

Comments

Row 6 of A267245.

Examples

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

Crossrefs

Cf. A267245.