A184682 Number of (n+1)X6 binary arrays with every 2X2 subblock singular.

568, 10384, 140816, 2171152, 31817360, 476660624, 7079094288, 105530924944, 1570852959248, 23397537190544, 348412932162320, 5188788920597392, 77271414617633808, 1150747018045489296, 17137111768900018448

Offset: 1

Author

R. H. Hardin Jan 19 2011

Keywords

• nonn

Comments

Column 5 of A184686

Examples

			Some solutions for 3X6
..0..0..1..0..0..0....1..1..0..0..0..0....0..1..0..0..0..0....0..0..1..1..1..1
..1..0..0..0..1..0....1..1..0..1..0..0....0..1..0..0..1..1....1..0..0..0..0..0
..1..0..1..0..0..0....1..1..0..0..0..1....0..1..0..0..1..1....0..0..0..0..0..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..200

Formula

Empirical: a(n)=25*a(n-1)-131*a(n-2)-771*a(n-3)+8180*a(n-4)-11482*a(n-5)-71100*a(n-6)+202352*a(n-7)+125888*a(n-8)-816032*a(n-9)+304768*a(n-10)+951040*a(n-11)-590848*a(n-12)-217088*a(n-13)+98304*a(n-14)