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

1,1

Comments

Row 6 of A266428.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical polynomial of degree 33

Formula

Empirical polynomial of degree 33 (see link above)

Example

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

Crossrefs

Cf. A266428.

Sequence in context: A053155 A367235 A355171 * A369473 A267243 A197570

Adjacent sequences: A266429 A266430 A266431 * A266433 A266434 A266435

Keyword

nonn

Author

R. H. Hardin, Dec 29 2015

Status

approved