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

1,1

Comments

Diagonal of A252574

Links

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

Example

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

Crossrefs

Sequence in context: A252567 A252574 A252575 * A269542 A237632 A304155

Adjacent sequences: A252563 A252564 A252565 * A252567 A252568 A252569

Keyword

nonn

Author

R. H. Hardin, Dec 18 2014

Status

approved