A199646 Number of nX7 0..2 arrays with values 0..2 introduced in row major order and each element equal to one or two horizontal and vertical neighbors.

11, 6628, 1396083, 342328663, 80053957248, 19161971644783, 4539946639286136, 1079929763429897946, 256503858825070983388

Offset: 1

Author

R. H. Hardin Nov 08 2011

Keywords

• nonn

Comments

Column 7 of A199647

Examples

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