A184555 Number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock summing to less than 4.

50, 5736, 3436266, 12900566348, 276510402290782, 35245029137091490532, 26246732217663407375879655, 115019923806287297509943176811916, 2957519612846906106776158316962863659667

Offset: 1

Author

R. H. Hardin Jan 17 2011

Keywords

• nonn

Comments

Diagonal of A184564

Examples

			Some solutions for 3X3
..2..2..2....1..2..0....2..0..2....2..0..2....1..2..2....2..2..0....2..1..2
..2..2..2....2..1..1....1..2..2....1..2..1....2..1..1....2..1..2....2..2..2
..2..0..1....0..2..2....0..2..2....0..2..1....0..1..2....2..1..1....1..2..0