A183316 Number of nX4 binary arrays with an element zero only if there are an even number of ones to its left and an even number of ones above it.

8, 27, 124, 480, 1975, 7833, 31428, 125103, 498825, 1985956, 7906167, 31469417, 125232138, 498389829, 1983161935, 7891800110, 31402125248, 124956937711, 497214816218, 1978508290987, 7872687718931, 31326612697486, 124652113265387

Offset: 1

Author

R. H. Hardin Jan 03 2011

Keywords

• nonn

Comments

Column 4 of A183322

Examples

			Some solutions for 5X4
..0..1..1..0....0..0..0..0....0..1..1..0....0..0..0..1....0..1..1..1
..0..1..1..0....0..0..0..0....0..1..1..0....0..1..1..1....0..1..1..1
..1..1..0..0....0..1..1..1....0..0..0..0....0..1..1..0....1..1..0..1
..1..1..1..1....0..1..1..1....0..0..0..0....0..0..0..0....1..1..0..1
..0..0..1..1....1..1..1..1....0..0..1..1....0..1..1..0....1..1..1..1
		

Links

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

Formula

Empirical: a(n)=a(n-1)+23*a(n-2)-10*a(n-3)-180*a(n-4)+34*a(n-5)+630*a(n-6)-63*a(n-7)-1081*a(n-8)+73*a(n-9)+914*a(n-10)-50*a(n-11)-352*a(n-12)+14*a(n-13)+47*a(n-14)+a(n-15)-a(n-16)