A204276 Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..2 introduced in row major order

108, 622, 128, 244, 736, 1496, 3664, 10288, 26048, 69472, 190912, 513344, 1395712

Offset

1,1

Comments

Diagonal of A204284

Links

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

Example

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

Crossrefs

Sequence in context: A160919 A129027 A288706 * A202194 A333757 A203373

Adjacent sequences: A204273 A204274 A204275 * A204277 A204278 A204279

Keyword

nonn

Author

R. H. Hardin Jan 13 2012

Status

approved