A221665 Sum of neighbor maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to the sum mod 3 of their horizontal, diagonal and antidiagonal neighbors in a random 0..2 nX4 array.

16, 256, 3772, 63200, 1048576, 16777216, 268281856, 4294967296, 68702508544, 1099511627776, 17592133540864, 281474976710656, 4503599627370496

Offset: 1

Author

R. H. Hardin Jan 21 2013

Keywords

• nonn

Comments

Column 4 of A221666

Examples

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