A251771 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum 3 or 6 and every diagonal and antidiagonal sum not 3 or 6

470, 4182, 43778, 524774, 39849294, 1752287522, 63113882510, 43476743042654, 6284003474380930, 629437620309947966, 4375644728066201664158, 1886133341869265972224930, 508745180020891822952693150

Offset

1,1

Comments

Diagonal of A251779

Links

R. H. Hardin, Table of n, a(n) for n = 1..14

Example

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

Crossrefs

Sequence in context: A253518 A254423 A254416 * A251152 A345535 A345787

Adjacent sequences: A251768 A251769 A251770 * A251772 A251773 A251774

Keyword

nonn

Author

R. H. Hardin, Dec 08 2014

Status

approved