A205157 Number of nX4 0..3 arrays with no occurrence of three equal elements in a row horizontally, vertically or nw-to-se diagonally, and new values 0..3 introduced in row major order.

12, 2191, 332285, 54314298, 8797534495, 1427843505563, 231638725420288, 37582214286016391, 6097402008530516671, 989257097238735049744, 160499289951117243179507, 26039769955147853451399045

Offset: 1

Author

R. H. Hardin Jan 22 2012

Keywords

• nonn

Comments

Column 4 of A205161

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210