A204362 Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly three ways, and new values 0..2 introduced in row major order

74, 466, 342, 704, 1984, 4856, 12896, 35872, 95456, 259520, 711424, 1933568

Offset

1,1

Comments

Diagonal of A204370

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=5
..0..0..1..1..1..2..1....0..1..1..1..2..2..2....0..0..0..0..0..0..0
..0..0..0..1..1..1..2....0..0..1..1..1..2..2....1..1..1..1..1..1..1
..1..0..0..0..1..1..1....0..0..0..1..1..1..2....1..1..1..1..1..1..1
..1..1..0..0..0..1..1....1..0..0..0..1..1..1....2..2..2..2..2..2..2
..1..1..1..0..0..0..1....1..1..0..0..0..1..1....0..0..0..0..0..0..0
..0..1..1..1..0..0..0....1..1..1..0..0..0..1....0..0..0..0..0..0..0
..1..0..1..1..1..0..0....2..1..1..1..0..0..0....0..2..2..2..2..2..2

Crossrefs

Sequence in context: A205754 A238022 A296025 * A321114 A205584 A280402

Adjacent sequences: A204359 A204360 A204361 * A204363 A204364 A204365

Keyword

nonn

Author

R. H. Hardin Jan 14 2012

Status

approved