A268747 Number of nX5 binary arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.

23, 244, 2615, 26334, 255651, 2425799, 22577073, 207252725, 1880654551, 16909709308, 150867667407, 1337324783132, 11788337576943, 103412756868981, 903363696442081, 7862056896605875, 68198486775427551, 589834799847933624

Offset: 1

Author

R. H. Hardin, Feb 12 2016

Keywords

• nonn

Comments

Column 5 of A268750.

Examples

			Some solutions for n=4
..0..1..0..0..1. .1..0..0..0..0. .0..1..0..1..0. .0..0..0..1..0
..1..0..0..1..0. .0..1..0..0..0. .0..0..0..0..1. .0..0..0..1..0
..0..0..0..0..1. .0..0..0..0..1. .1..0..0..0..1. .0..0..0..0..1
..1..0..1..1..0. .1..0..0..0..0. .0..0..0..0..0. .0..1..0..0..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Crossrefs

Cf. A268750.

Formula

Empirical: a(n) = 8*a(n-1) +56*a(n-2) -288*a(n-3) -1506*a(n-4) +870*a(n-5) +7568*a(n-6) -1632*a(n-7) -15481*a(n-8) +4624*a(n-9) +13495*a(n-10) -6192*a(n-11) -4336*a(n-12) +2890*a(n-13) +82*a(n-14) -288*a(n-15) +24*a(n-16) +8*a(n-17) -a(n-18)