A265452 Number of nX2 0..n+2-2 arrays with each element differing from its horizontal and vertical neighbors by one or two.

2, 18, 250, 3358, 42282, 502154, 5710302, 62782966, 672520310, 7056533978, 72819524370, 741279145398, 7460955607878, 74381377429158, 735539563061590, 7222916531541006, 70499118369836786, 684459097597365542

Offset: 1

Author

R. H. Hardin, Dec 09 2015

Keywords

• nonn

Comments

Column 2 of A265458.

Examples

			Some solutions for n=4
..1..2....3..1....1..0....4..3....3..2....2..3....2..0....1..3....4..2....3..2
..2..3....4..2....0..2....2..1....2..1....3..4....0..1....2..4....3..1....1..0
..1..2....2..1....2..3....1..3....1..2....4..2....1..2....1..2....1..3....0..1
..3..4....1..3....3..1....0..1....3..4....2..1....2..3....2..1....3..1....2..3
		

Links

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

Crossrefs

Cf. A265458.