A252184 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 1 3 6 or 7.

945, 1886, 3705, 9233, 24956, 57629, 147696, 488200, 1339760, 4201296, 53487944, 243810896, 1121545296, 82644345928, 442293577808

Offset

1,1

Comments

Diagonal of A252192

Links

Table of n, a(n) for n=1..15.

Example

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

Crossrefs

Sequence in context: A275472 A275066 A127667 * A188263 A188342 A109729

Adjacent sequences: A252181 A252182 A252183 * A252185 A252186 A252187

Keyword

nonn

Author

R. H. Hardin, Dec 15 2014

Status

approved