A267793 Number of 7Xn 0..1 arrays with every repeated value in every row greater than or equal to, and in every column greater than, the previous repeated value.

20, 400, 8000, 102954, 1234716, 13126812, 132388406, 1271314080, 11831791048, 107394660068, 957081246026, 8408442934462, 73058790472446, 629272663467509, 5382292144211926, 45776729662954256, 387532677732355814

Offset

1,1

Comments

Row 7 of A267788.

Links

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

Example

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

Crossrefs

Cf. A267788.

Sequence in context: A189198 A224019 A171294 * A009964 A285874 A007577

Adjacent sequences: A267790 A267791 A267792 * A267794 A267795 A267796

Keyword

nonn

Author

R. H. Hardin, Jan 20 2016

Status

approved