A199654 Number of nX7 0..2 arrays with values 0..2 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.

365, 571530, 713445976, 898852775335, 1132589231853096, 1427019666767669979, 1797997097480559332224, 2265416280260844187870380, 2854348741463033805904551375, 3596383952736036093799275624989

Offset: 1

Author

R. H. Hardin Nov 08 2011

Keywords

• nonn

Comments

Column 7 of A199655

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..35