A266432 Number of 6Xn binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing.

7, 50, 433, 4383, 45907, 448649, 3889553, 29520031, 197001842, 1168481498, 6234449897, 30265682491, 135048855227, 558800630541, 2160517610564, 7856777499625, 27025799141430, 88367939113010, 275837411169430

Offset: 1

Author

R. H. Hardin, Dec 29 2015

Keywords

• nonn

Comments

Row 6 of A266428.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical polynomial of degree 33

Crossrefs

Cf. A266428.

Formula

Empirical polynomial of degree 33 (see link above)