A266425 Number of nX5 binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing.

6, 41, 259, 1556, 8764, 45907, 223075, 1005991, 4224203, 16588684, 61226525, 213418690, 705807396, 2223963956, 6702140026, 19383434369, 53965133477, 145029252226, 377163396856, 951257706522, 2331468492530, 5562985385965

Offset

1,1

Comments

Column 5 of A266428.

Links

R. H. Hardin, Table of n, a(n) for n = 1..31

Example

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

Crossrefs

Cf. A266428.

Sequence in context: A295117 A198795 A320090 * A194781 A323969 A252980

Adjacent sequences: A266422 A266423 A266424 * A266426 A266427 A266428

Keyword

nonn

Author

R. H. Hardin, Dec 29 2015

Status

approved