A184375 1/3 the number of (n+1)X9 0..2 arrays with every 2X2 subblock having at least two equal elements connected horizontally or vertically.

22064643, 90163722073, 360402692568245, 1444622701339019869, 5788675585887326994869, 23196517518911246631354055, 92953139774330929595592449437, 372482322079037724494019844619359

Offset: 1

Author

R. H. Hardin Jan 12 2011

Keywords

• nonn

Comments

Column 8 of A184376

Examples

			Some solutions for 3X9 with a(1,1)=0
..0..0..0..0..0..1..2..2..2....0..0..0..0..0..0..0..0..2
..0..0..0..0..0..0..2..2..2....0..0..0..0..0..2..1..0..1
..0..0..0..0..0..1..2..2..0....0..0..0..0..0..1..1..0..2
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..25