A204974 Number of nX4 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.

11, 726, 16813, 451468, 11815256, 311275169, 8202482914, 216132492162, 5694910498914, 150054777556991, 3953775892498008, 104177764014536592, 2744972159153714019, 72327078831355250520, 1905740996306739704109

Offset: 1

Author

R. H. Hardin Jan 21 2012

Keywords

• nonn

Comments

Column 4 of A204978

Examples

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

Links

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