A184201 Number of (n+1)X4 binary arrays with no 2X2 subblock containing fewer than two 1s.

108, 1028, 8969, 80812, 721939, 6468501, 57909336, 518574936, 4643443850, 41579555979, 372319892218, 3333908362279, 29853191601007, 267317859115808, 2393674819332654, 21433956109836050, 191928522580951331

Offset: 1

Author

R. H. Hardin Jan 10 2011

Keywords

• nonn

Comments

Column 3 of A184207

Examples

			Some solutions for 3X4
..1..1..1..1....0..0..1..1....0..1..0..1....1..0..0..1....0..1..0..1
..0..1..1..0....1..1..1..1....1..1..1..1....0..1..1..1....1..1..1..0
..1..1..1..1....1..0..0..1....0..0..0..0....1..1..1..1....0..0..1..1
		

Links

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

Formula

Empirical: a(n)=9*a(n-1)+8*a(n-2)-79*a(n-3)+19*a(n-4)+134*a(n-5)-54*a(n-6)-56*a(n-7)+23*a(n-8)+5*a(n-9)-2*a(n-10)