A252057 Number of (n+2) X (n+2) 0..2 arrays with every 3 X 3 subblock row, column, diagonal and antidiagonal sum not equal to 1 2 or 4.

125, 346, 2349, 30182, 664938, 23078709, 1229012088, 100756110010, 12788352089472, 2503090258367123, 754443908148691278, 350544406954555223319

Offset

1,1

Comments

Diagonal of A252065.

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Cf. A252065.

Sequence in context: A250579 A161855 A353502 * A045184 A059470 A316387

Adjacent sequences: A252054 A252055 A252056 * A252058 A252059 A252060

Keyword

nonn

Author

R. H. Hardin, Dec 13 2014

Status

approved