A266939 Number of 6Xn binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.

7, 29, 92, 288, 871, 2577, 7185, 19529, 50216, 125786, 298869, 696808, 1546941, 3382516, 7085876, 14650326, 29153966, 57417292, 109223923, 205966389, 376634957, 683318087, 1206075185, 2114385852, 3615867548

Offset

1,1

Comments

Row 6 of A266935.

Links

Table of n, a(n) for n=1..25.

Example

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

Crossrefs

Cf. A266935.

Sequence in context: A258475 A320753 A053295 * A055798 A002664 A290901

Adjacent sequences: A266936 A266937 A266938 * A266940 A266941 A266942

Keyword

nonn

Author

R. H. Hardin, Jan 06 2016

Status

approved