A221138 Number of n X 7 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2.

32, 57121, 58132316, 75512292025, 86907967843320, 106295637843093924

Offset: 1

Author

R. H. Hardin Jan 02 2013

Keywords

• nonn

Comments

Column 7 of A221139.

Examples

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

Crossrefs

Cf. A221139.