A266474 Number of 7Xn binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing.

8, 42, 303, 2574, 22128, 175180, 1231170, 7652503, 42460424, 212971589, 977395362, 4147719749, 16420984346, 61103700814, 215040758842, 719522481940, 2299243641848, 7043942786447, 20758083457211, 59015575393057

Offset: 1

Author

R. H. Hardin, Dec 29 2015

Keywords

• nonn

Comments

Row 7 of A266470.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical polynomial of degree 34

Crossrefs

Cf. A266470.

Formula

Empirical polynomial of degree 34 (see link above)