A252297 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 1 3 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 1 3 6 or 7

864, 1031, 1677, 3032, 9368, 24076, 48579, 323902, 1058568, 2208135, 98294702, 395901344

Offset

1,1

Comments

Diagonal of A252305

Links

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

Example

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

Crossrefs

Sequence in context: A341669 A344289 A344287 * A252298 A252305 A252306

Adjacent sequences: A252294 A252295 A252296 * A252298 A252299 A252300

Keyword

nonn

Author

R. H. Hardin, Dec 16 2014

Status

approved