A204972 Number of n X n 0..2 arrays with no occurrence of three equal elements in a row horizontally, vertically, diagonally or antidiagonally, and new values 0..2 introduced in row major order

1, 14, 1217, 451468, 594430765, 2924321664147

Offset

1,2

Comments

Diagonal of A204978

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Sequence in context: A323181 A206613 A198712 * A209677 A137603 A160107

Adjacent sequences: A204969 A204970 A204971 * A204973 A204974 A204975

Keyword

nonn

Author

R. H. Hardin Jan 21 2012

Status

approved