A229928 Number of nX2 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value 2-x(i,j).

3, 19, 115, 739, 4679, 29569, 187211, 1185283, 7502685, 47491531, 300627179, 1902998895, 12046125511, 76252939087, 482687382245, 3055450450511, 19341249601691, 122431683941789, 775002524638781, 4905829047952315

Offset: 1

Author

R. H. Hardin, Oct 04 2013

Keywords

• nonn

Comments

Column 2 of A229934

Examples

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

Links

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

Formula

Empirical: a(n) = 6*a(n-1) -3*a(n-2) +32*a(n-3) -a(n-4) +7*a(n-5) +43*a(n-6) +47*a(n-7) +7*a(n-8) +26*a(n-9) -13*a(n-10) +6*a(n-11) -5*a(n-12) +a(n-13)