A184468 1/6 the number of (n+2)X(n+2) 0..2 arrays with each 3X3 subblock containing one of one value, four of another, and four of the last

315, 2755, 14119, 53739, 247879, 904411, 2909367

Offset

1,1

Comments

Diagonal of A184477

Links

Table of n, a(n) for n=1..7.

Example

Some solutions with a(1,1)=0 for 4X4
..0..2..1..0....0..2..1..0....0..1..2..0....0..0..1..1....0..2..1..0
..0..0..0..0....1..1..2..2....0..0..1..1....1..0..0..0....1..1..2..1
..1..1..1..1....2..2..1..1....1..0..1..0....1..2..1..1....1..2..2..1
..0..1..2..0....1..0..2..1....2..0..1..2....0..0..1..1....1..2..0..1

Crossrefs

Sequence in context: A184469 A088010 A145753 * A231760 A048905 A200314

Adjacent sequences: A184465 A184466 A184467 * A184469 A184470 A184471

Keyword

nonn

Author

R. H. Hardin Jan 15 2011

Status

approved