A205256 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally, and new values 0..1 introduced in row major order

240, 26185, 10529929, 15472955417, 83226275730613, 1640204498026982975, 118390237532638666425606, 31296002786422594003958101231

Offset

1,1

Comments

Diagonal of A205264

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A338562 A342990 A342306 * A110163 A323981 A258082

Adjacent sequences: A205253 A205254 A205255 * A205257 A205258 A205259

Keyword

nonn

Author

R. H. Hardin Jan 24 2012

Status

approved