A204677 Number of n X n 0..3 arrays with no occurrence of three equal elements in a row horizontally, vertically, diagonally or antidiagonally, and new values 0..3 introduced in row major order.

1, 15, 6451, 40919141, 2579588216958

Offset: 1

Author

R. H. Hardin, Jan 18 2012

Keywords

• nonn

Comments

Diagonal of A204685.

Examples

			Some solutions for n=5
..0..1..1..0..2....0..0..1..1..0....0..0..1..0..2....0..0..1..0..0
..2..3..1..3..3....2..0..3..3..0....2..1..1..3..2....0..2..3..1..1
..0..0..3..2..3....2..3..1..0..3....0..1..0..3..3....2..0..1..0..0
..3..2..0..1..2....0..3..2..1..0....2..2..3..2..0....0..0..3..0..1
..0..3..3..1..2....2..2..3..0..0....1..0..3..3..2....1..2..1..3..2
		

Crossrefs

Cf. A204685.