A252235 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 1 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 1 3 4 6 or 7

342, 3896, 108882, 1179792, 193004352, 78534150416, 1236950585856, 2850002858756096, 19061766897822614016, 332041393326772518912, 11522592664946008068980736, 1277874485884710320427331813376

Offset

1,1

Comments

Diagonal of A252243

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

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

Crossrefs

Sequence in context: A252236 A158595 A231267 * A272380 A023909 A035844

Adjacent sequences: A252232 A252233 A252234 * A252236 A252237 A252238

Keyword

nonn

Author

R. H. Hardin, Dec 15 2014

Status

approved