A184664 Number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock summing to less than 6.

150, 67330, 266060160, 11348244616180, 4705518067315949795, 19869188673828370548366580, 837185450907978354702239657652981

Offset: 1

Author

R. H. Hardin Jan 19 2011

Keywords

• nonn

Comments

Diagonal of A184673

Examples

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