A251821 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not 3 or 6 and every diagonal and antidiagonal sum 3 or 6

1890, 8674, 130826, 1692106, 101716526, 12583469514, 395032012018, 159028764990482, 131396089518942658, 8109916816692482850, 21693086973745341445330

Offset

1,1

Comments

Diagonal of A251829

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Sequence in context: A187743 A251829 A251822 * A151773 A020321 A177086

Adjacent sequences: A251818 A251819 A251820 * A251822 A251823 A251824

Keyword

nonn

Author

R. H. Hardin, Dec 09 2014

Status

approved