A205272 Number of (n+2)X9 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally, and new values 0..1 introduced in row major order

30799890, 9173723833, 2723625483808, 795473851332758, 233446295978015247, 68514158629820422369, 20100570131126768440800, 5897626069731714817000035, 1730408183581457830549108452, 507710502684969001154188837839

Offset

1,1

Comments

Column 7 of A205273

Links

R. H. Hardin, Table of n, a(n) for n = 1..99

Example

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

Crossrefs

Sequence in context: A156420 A252120 A297447 * A261986 A103576 A288087

Adjacent sequences: A205269 A205270 A205271 * A205273 A205274 A205275

Keyword

nonn

Author

R. H. Hardin Jan 24 2012

Status

approved