A220333 Equals two maps: number of 6Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..1 6Xn array.

1, 351, 15316, 876714, 46094354, 2680626797

Offset: 1

Author

R. H. Hardin Dec 10 2012

Keywords

• nonn

Comments

Row 6 of A220328

Examples

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