A252361 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 3 4 6 or 7

130, 276, 3054, 45516, 1007920, 35124242, 1875961304, 154187447172, 19636182429590, 3846077102733552, 1158727663221999306, 538512893012205801320, 385891172081488215159354

Offset

1,1

Comments

Diagonal of A252369

Links

Table of n, a(n) for n=1..13.

Example

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

Crossrefs

Sequence in context: A064687 A238194 A252263 * A252082 A253044 A253037

Adjacent sequences: A252358 A252359 A252360 * A252362 A252363 A252364

Keyword

nonn

Author

R. H. Hardin, Dec 17 2014

Status

approved