A267250 Number of 7Xn binary arrays with row sums nondecreasing and columns lexicographically nondecreasing.

8, 255, 5804, 129129, 2499080, 43555569, 683027146, 9748574556, 127531124302, 1540596418525, 17291858116440, 181338323456395, 1785428392643952, 16575758386318547

Offset

1,1

Comments

Row 7 of A267245.

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Cf. A267245.

Sequence in context: A277421 A171612 A053717 * A034674 A317511 A300176

Adjacent sequences: A267247 A267248 A267249 * A267251 A267252 A267253

Keyword

nonn

Author

R. H. Hardin, Jan 12 2016

Status

approved