A184448 1/36 the number of (n+2) X (n+2) 0..2 arrays with each 3 X 3 subblock containing two of one value, two of another, and five of the last.

63, 600, 3125, 11766, 53350, 196974, 660654

Offset

1,1

Comments

Diagonal of A184457.

Links

Table of n, a(n) for n=1..7.

Example

Some solutions with a(1,1)=0 for 4 X 4
..0..0..0..0....0..1..1..0....0..0..2..0....0..1..0..0....0..1..2..0
..0..0..1..0....2..1..2..2....0..1..2..0....0..0..2..0....1..0..0..2
..1..2..2..1....1..1..0..1....0..0..1..0....1..2..0..1....2..0..0..1
..1..1..1..1....0..1..1..0....0..0..2..0....0..1..0..0....2..0..1..2

Crossrefs

Cf. A184457.

Sequence in context: A307527 A217264 A179537 * A228262 A340902 A181125

Adjacent sequences: A184445 A184446 A184447 * A184449 A184450 A184451

Keyword

nonn

Author

R. H. Hardin Jan 14 2011

Status

approved