A266427 Number of nX7 binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing.

8, 92, 1170, 16585, 251381, 3889553, 59155748, 861030491, 11809616668, 151566391972, 1816912772913, 20365495779036

Offset

1,1

Comments

Column 7 of A266428.

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Cf. A266428.

Sequence in context: A133271 A180903 A385497 * A239644 A099142 A007556

Adjacent sequences: A266424 A266425 A266426 * A266428 A266429 A266430

Keyword

nonn

Author

R. H. Hardin, Dec 29 2015

Status

approved