A183403 Number of n X n binary arrays with each sum of a(1..i,1..j) no greater than i*j/2

1, 7, 114, 12203, 3770481, 6583423572, 36263011629138, 1032996356637032944, 97616935274858472388880

Offset

1,2

Comments

Diagonal of A183407

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for 4X4
..0..0..1..1....0..0..1..0....0..0..1..0....0..0..1..0....0..0..0..1
..1..0..0..1....0..1..0..0....1..0..0..1....1..1..0..0....0..0..0..1
..0..0..0..1....0..0..1..0....0..0..1..0....0..0..1..0....1..0..0..1
..0..0..0..0....0..1..0..1....0..1..0..0....0..1..0..0....1..0..1..1

Crossrefs

Sequence in context: A199672 A240288 A220343 * A127877 A082487 A081798

Adjacent sequences: A183400 A183401 A183402 * A183404 A183405 A183406

Keyword

nonn

Author

R. H. Hardin Jan 04 2011

Status

approved