A208838 Number of nX6 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 1 and 1 1 0 vertically.

26, 676, 2430, 9801, 49126, 272206, 1644265, 10399480, 67895010, 451450105, 3037317426, 20579585922, 140057351785, 955762122172, 6533166024022, 44704031815465, 306089086744206, 2096624267502790, 14364797790087081

Offset: 1

Author

R. H. Hardin Mar 01 2012

Keywords

• nonn

Comments

Column 6 of A208840

Examples

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

Links

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

Formula

Empirical: a(n) = 11*a(n-1) -17*a(n-2) -124*a(n-3) +276*a(n-4) +396*a(n-5) -902*a(n-6) -462*a(n-7) +946*a(n-8) +220*a(n-9) -340*a(n-10) -44*a(n-11) +39*a(n-12) +3*a(n-13) -a(n-14) for n>15