A198527 Number of nX7 0..4 arrays with values 0..4 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.

855, 47436498, 3201911378187, 217885196778717007, 14827770532074166305565, 1009078065869144136137180812

Offset: 1

Author

R. H. Hardin Oct 26 2011

Keywords

• nonn

Comments

Column 7 of A198528

Examples

			Some solutions for n=4
..0..0..0..1..0..0..2....0..0..0..1..0..2..3....0..0..0..1..0..2..2
..1..1..0..0..2..1..3....1..1..0..0..2..4..1....1..1..0..0..2..3..0
..0..0..1..0..2..3..0....0..0..1..0..2..2..1....0..0..1..0..2..1..1
..0..0..1..0..0..3..4....0..0..1..0..0..0..4....0..0..1..0..0..0..3