A252335 Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 2 3 or 4

52, 268, 2978, 43708, 960912, 33579112, 1793526072, 147518483334, 18786369968734, 3677603612834944, 1107920643675524618, 515039036348578802392, 369081216309162786350824

Offset

1,1

Comments

Diagonal of A252343

Links

R. H. Hardin, Table of n, a(n) for n = 1..14

Example

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

Crossrefs

Sequence in context: A070147 A236517 A320556 * A230533 A235654 A118328

Adjacent sequences: A252332 A252333 A252334 * A252336 A252337 A252338

Keyword

nonn

Author

R. H. Hardin, Dec 16 2014

Status

approved