A184373 1/3 the number of (n+1)X7 0..2 arrays with every 2X2 subblock having at least two equal elements connected horizontally or vertically.

420633, 281803871, 185547841629, 122443114867993, 80778452206783159, 53293289955084658949, 35159890626610196979641, 23196517518911246631354055, 15303755709562804997482560737, 10096556166552290137769922123373

Offset: 1

Author

R. H. Hardin Jan 12 2011

Keywords

• nonn

Comments

Column 6 of A184376

Examples

			Some solutions for 3X7 with a(1,1)=0
..0..0..0..0..0..0..0....0..0..0..0..0..0..0....0..0..0..0..0..0..0
..1..2..2..0..0..0..0....1..1..2..0..0..0..1....1..1..0..0..0..0..1
..1..1..2..0..2..0..0....0..0..2..0..2..0..0....0..1..0..1..0..2..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..154