A252285 Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 or 4

564, 1920, 8208, 68320, 1227461, 41069194, 2178722578, 178658210404, 22705656001038, 4445145404367921

Offset

1,1

Comments

Diagonal of A252293

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A274471 A252293 A252286 * A206131 A283782 A203781

Adjacent sequences: A252282 A252283 A252284 * A252286 A252287 A252288

Keyword

nonn

Author

R. H. Hardin, Dec 16 2014

Status

approved