A230749 Number of (n+3)X(n+3) 0..2 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.

12, 5544, 13305708, 116879941620, 5769362600920812, 1504181314566629793432, 2135728868490621147879828300, 16459977111484024315408273362622152, 689468967599129606177339374031370776847408

Offset: 1

Author

R. H. Hardin, Oct 29 2013

Keywords

• nonn

Comments

Diagonal of A230757

Examples

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