A183595 1/6 the number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock containing all three values.

6, 204, 17174, 3831324, 2220901926, 3366668183708, 13330538464876654, 137936054886331468840, 3729575155642883493035294

Offset: 1

Author

R. H. Hardin Jan 05 2011

Keywords

• nonn

Comments

Diagonal of A183603

Examples

			Some solutions with a(1,1)=0 for 3X3
..0..0..0....0..2..1....0..1..0....0..2..0....0..2..0....0..2..0....0..0..1
..1..2..1....2..1..0....2..0..2....1..0..1....1..1..1....2..1..2....1..2..1
..0..0..0....0..1..2....1..1..1....2..2..1....2..0..2....1..0..2....2..0..2