A219145 Unchanging value maps: number of 4Xn binary arrays indicating the locations of corresponding elements unequal to no horizontal, diagonal or antidiagonal neighbor in a random 0..2 4Xn array.

1, 51, 331, 1774, 10505, 59127, 341648, 1963817, 11341895, 65406069, 377314947, 2175983774, 12550566460, 72389111386, 417539600863, 2408347532016, 13891206637891

Offset: 1

Author

R. H. Hardin Nov 12 2012

Keywords

• nonn

Comments

Row 4 of A219142

Examples

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