A204476 Number of (n+2)X(n+2) 0..3 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..3 introduced in row major order.

80, 1326, 608, 1482, 6494, 18410, 66580, 265906, 948920, 3573030, 13667010

Offset

1,1

Comments

Diagonal of A204483

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for n=3
..0..1..1..2..0....0..0..0..0..1....0..0..0..1..0....0..1..1..2..0
..0..1..1..2..0....1..1..1..0..2....1..1..1..1..1....0..1..1..1..1
..0..1..1..2..0....0..0..0..0..0....1..1..1..1..1....0..1..1..2..1
..1..1..1..2..0....0..0..0..0..0....2..2..2..2..2....1..1..1..2..1
..2..1..1..2..0....1..0..2..2..2....0..0..0..0..0....3..1..1..2..1

Crossrefs

Sequence in context: A296353 A126861 A038727 * A151603 A199533 A333075

Adjacent sequences: A204473 A204474 A204475 * A204477 A204478 A204479

Keyword

nonn

Author

R. H. Hardin, Jan 15 2012

Status

approved