A241323 Number of nX2 0..3 arrays with no element equal to fewer vertical neighbors than horizontal neighbors, with new values 0..3 introduced in row major order.

1, 8, 85, 1030, 13011, 165924, 2121033, 27129985, 347071157, 4440219758, 56806066313, 726751710350, 9297746189765, 118951351657555, 1521812314158867, 19469410910818078, 249083253366686135, 3186663809907191548

Offset: 1

Author

R. H. Hardin, Apr 19 2014

Keywords

• nonn

Comments

Column 2 of A241328

Examples

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

Links

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

Formula

Empirical: a(n) = 17*a(n-1) -57*a(n-2) +43*a(n-3) -37*a(n-4) +109*a(n-5) -62*a(n-6) -48*a(n-8) +36*a(n-9) for n>10