A233725 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having the sum of the absolute values of the edge differences equal to 6 and no adjacent elements equal.

40, 756, 29816, 2723072, 578163016, 297173770244, 365411698279744, 1098248392267801764, 7928574480658025834472, 139889299008340046298542520

Offset: 1

Author

R. H. Hardin, Dec 15 2013

Keywords

• nonn

Comments

Diagonal of A233733

Examples

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