A199653 Number of nX6 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.

122, 67774, 31120632, 14399942873, 6663970316970, 3083761998081891, 1427019666767669979, 660357476435139192982, 305582323780950052573456, 141409100632588861437301956, 65437468685616944338442793185

Offset: 1

Author

R. H. Hardin Nov 08 2011

Keywords

• nonn

Comments

Column 6 of A199655

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..149