A266544 Number of nX5 binary arrays with rows and columns lexicographically nondecreasing and row and column sums nonincreasing.

2, 4, 8, 16, 36, 58, 110, 196, 363, 695, 1157, 2023, 3446, 5755, 9485, 14901, 23156, 35568, 53350, 79575, 114919, 165223, 233650, 327246, 453231, 618603, 836533, 1122433, 1490044, 1967385, 2565448, 3329153, 4284884, 5482977, 6970961, 8800503

Offset

1,1

Comments

Column 5 of A266547.

Links

R. H. Hardin, Table of n, a(n) for n = 1..60

Example

Some solutions for n=6
..0..1..1..1..1....0..0..1..1..1....0..1..1..1..1....0..1..1..1..1
..0..1..1..1..1....0..1..0..1..1....0..1..1..1..1....0..1..1..1..1
..1..0..0..1..1....1..0..1..0..0....1..0..0..1..1....1..0..0..0..1
..1..0..1..0..0....1..0..1..0..0....1..0..0..1..1....1..0..0..1..0
..1..1..0..0..0....1..1..0..0..0....1..1..1..0..0....1..0..1..0..0
..1..1..0..0..0....1..1..0..0..0....1..1..1..0..0....1..1..0..0..0

Crossrefs

Cf. A266547.

Sequence in context: A126137 A085294 A195327 * A348414 A333051 A034340

Adjacent sequences: A266541 A266542 A266543 * A266545 A266546 A266547

Keyword

nonn

Author

R. H. Hardin, Dec 31 2015

Status

approved