A183405 Number of nX4 binary arrays with each sum of a(1..i,1..j) no greater than i*j/2.

6, 78, 850, 12203, 154079, 2291035, 30897341, 467710777, 6547006490, 100186985054, 1436382214914, 22141316955632, 322776632209433, 5001593745014347, 73814087963795016, 1148305241863914557

Offset

1,1

Comments

Column 4 of A183407

Links

R. H. Hardin, Table of n, a(n) for n = 1..28

Example

Some solutions for 6X4
..0..0..1..0....0..1..0..0....0..0..1..0....0..1..0..0....0..0..0..0
..1..0..0..0....0..0..0..0....0..0..1..0....0..1..0..0....1..1..1..0
..0..0..1..0....0..1..1..0....1..1..0..0....0..0..0..0....0..0..1..0
..1..0..1..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..0..0..0..0....0..1..1..0....0..1..1..0....1..0..1..0....0..0..0..0
..0..1..1..1....1..1..1..1....1..1..1..0....0..0..0..1....1..0..0..1

Crossrefs

Sequence in context: A306096 A370714 A145360 * A068884 A186663 A069670

Adjacent sequences: A183402 A183403 A183404 * A183406 A183407 A183408

Keyword

nonn

Author

R. H. Hardin, Jan 04 2011

Status

approved