A266934 Number of nX7 binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.

2, 6, 21, 115, 816, 7185, 68890, 671796, 6347005, 56180274, 460040399, 3470013146, 24151911854, 155703390684

Offset

1,1

Comments

Column 7 of A266935.

Links

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

Example

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

Crossrefs

Cf. A266935.

Sequence in context: A128528 A001349 A126060 * A182157 A356015 A110306

Adjacent sequences: A266931 A266932 A266933 * A266935 A266936 A266937

Keyword

nonn

Author

R. H. Hardin, Jan 06 2016

Status

approved