A183446 Number of nX5 binary arrays with every 1 having exactly two king-move neighbors equal to 1.

1, 33, 107, 283, 2054, 9208, 34867, 176949, 833001, 3619285, 16979210, 79536106, 362125386, 1678147584, 7816357207, 36107427015, 167380756056, 778109691292, 3610178963149, 16759752441151, 77893373268254, 361906632299828

Offset: 1

Author

R. H. Hardin Jan 04 2011

Keywords

• nonn

Comments

Column 5 of A183450

Examples

			Some solutions for 7X5
..0..1..1..0..0....0..0..0..0..0....0..0..0..1..1....0..0..0..0..0
..1..0..0..1..0....0..1..0..0..0....1..1..0..1..0....0..0..0..0..0
..0..1..1..0..0....1..1..0..1..0....1..0..0..0..0....0..1..0..0..0
..0..0..0..0..0....0..0..0..1..1....0..0..0..0..0....1..1..0..0..0
..1..0..0..0..0....1..1..0..0..0....0..0..0..0..0....0..0..0..0..0
..1..1..0..1..1....0..1..0..0..1....1..0..0..1..0....0..1..0..0..0
..0..0..0..1..0....0..0..0..1..1....1..1..0..1..1....0..1..1..0..0
		

Links

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

Formula

Empirical: a(n)=6*a(n-1)-4*a(n-2)+26*a(n-3)-181*a(n-4)-17*a(n-5)+101*a(n-6)+1148*a(n-7)-826*a(n-8)+575*a(n-9)-429*a(n-10)-160*a(n-11)-83*a(n-12)-913*a(n-13)-799*a(n-14)+405*a(n-15)+185*a(n-16)+74*a(n-17)-8*a(n-18)-33*a(n-19)+6*a(n-20)