A205407 - OEIS

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A205407

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 two ways, and new values 0..2 introduced in row major order

468, 44596, 10331386, 2839359056, 2520131261396

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Diagonal of A205415

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=3

..0..1..1..1..1....0..0..0..0..0....0..0..0..1..0....0..0..1..0..0

..1..1..2..2..1....0..1..2..2..1....2..2..1..1..0....2..1..1..1..0