A266433 Number of 7Xn binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing.

8, 70, 826, 12758, 223075, 3825307, 59155748, 798834778, 9379683461, 96481143688, 879275711012, 7183343579974, 53182973236784, 360298764101463, 2252503422916387, 13090825673375302, 71176326297105679, 364068218093477268

Offset: 1

Author

R. H. Hardin, Dec 29 2015

Keywords

• nonn

Comments

Row 7 of A266428.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical polynomial of degree 57

Crossrefs

Cf. A266428.

Formula

Empirical polynomial of degree 57 (see link above)