A252566 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 5 6 or 7.

702, 868, 4168, 25882, 498696, 11285381, 155864925, 12185963853, 945844092853, 24332552409889, 8322243636131517, 2215111350571613524, 98531704627753178786, 155638652503561131141300

Offset: 1

Author

R. H. Hardin, Dec 18 2014

Keywords

• nonn

Comments

Diagonal of A252574

Examples

			Some solutions for n=4
..0..0..2..0..0..1....0..0..2..0..0..2....2..1..3..1..1..3....1..0..0..2..0..0
..2..0..0..2..0..0....3..1..2..3..2..2....2..0..0..2..0..0....0..1..0..0..2..0
..2..3..2..2..3..2....0..2..0..0..2..0....0..2..0..0..2..0....2..2..3..1..2..3
..0..0..2..0..0..1....0..0..2..0..0..1....2..2..3..2..2..3....2..0..0..2..0..0
..1..0..0..2..0..0....3..1..1..3..2..2....1..0..0..1..0..0....0..2..0..0..2..0
..2..3..2..2..3..2....0..2..0..0..2..0....0..1..0..0..1..0....1..2..3..2..1..3
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..15