A251783 Number of (n+2) X (n+2) 0..3 arrays with no row, column, diagonal or antidiagonal in any 3 X 3 subblock summing to 2, 3, 6, or 7.

1280, 2640, 16710, 149364, 2432344, 52977162, 2223220200, 171503981892, 20081331006806, 3867096597138664, 1162903308152378970, 538715029223098678532

Offset

1,1

Comments

Diagonal of A251791.

Links

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

Example

Some solutions for n=4
..2..2..1..1..2..2....0..3..2..0..2..2....0..0..0..0..0..0....0..3..1..0..3..2
..3..3..3..3..3..3....1..3..1..0..3..1....2..2..1..1..2..2....3..1..0..3..1..0
..0..0..0..0..0..0....0..3..2..0..3..2....3..3..3..3..3..2....2..0..3..2..0..3
..1..2..1..2..1..2....0..3..1..0..3..1....0..0..0..0..0..1....0..3..2..0..3..2
..3..3..3..3..3..3....0..3..2..0..3..2....2..1..2..2..1..1....3..1..0..3..1..0
..0..0..0..0..0..0....1..3..1..0..3..1....3..3..3..3..3..3....2..0..3..1..0..3

Crossrefs

Cf. A251791.

Sequence in context: A251791 A251784 A234315 * A224645 A237953 A237236

Adjacent sequences: A251780 A251781 A251782 * A251784 A251785 A251786

Keyword

nonn

Author

R. H. Hardin, Dec 08 2014

Status

approved