A183412 Number of nX5 binary arrays with each sum of a(1..i,1..j) no greater than i*j/2 and rows and columns in nondecreasing order

3, 21, 152, 1518, 11499, 98343, 556989, 3662106, 16124119, 85225430, 312644461, 1392323322, 4440186675, 17261781178, 49427257741, 171990299716, 450949023627, 1430808802178, 3490735786071, 10240050566337, 23490703637555

Offset

1,1

Comments

Column 5 of A183413

Links

R. H. Hardin, Table of n, a(n) for n = 1..32

Example

Some solutions for 4X5
..0..0..0..0..1....0..0..0..0..1....0..0..0..0..0....0..0..0..0..1
..0..0..1..1..0....0..0..1..1..1....0..0..1..1..1....0..0..0..0..1
..1..1..0..0..0....0..1..0..0..0....0..1..0..0..1....0..1..1..1..1
..1..1..1..1..0....1..1..1..1..0....0..1..0..1..1....1..0..0..0..0

Crossrefs

Sequence in context: A037656 A074577 A007566 * A155627 A163472 A229809

Adjacent sequences: A183409 A183410 A183411 * A183413 A183414 A183415

Keyword

nonn

Author

R. H. Hardin Jan 04 2011

Status

approved