A207942 Number of 6Xn 0..1 arrays avoiding 0 0 1 and 1 0 0 horizontally and 0 0 1 and 1 1 0 vertically.

12, 144, 556, 2239, 11256, 58602, 319439, 1760946, 9794226, 54631117, 305277128, 1707053280, 9549210261, 53426703442, 298941739494, 1672751399083, 9360192196998, 52377176867242, 293090264883289, 1640067205915482

Offset: 1

Author

R. H. Hardin Feb 21 2012

Keywords

• nonn

Comments

Row 6 of A207938

Examples

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

Links

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

Formula

Empirical: a(n) = 10*a(n-1) -13*a(n-2) -131*a(n-3) +320*a(n-4) +667*a(n-5) -2129*a(n-6) -1725*a(n-7) +6833*a(n-8) +2569*a(n-9) -11863*a(n-10) -2473*a(n-11) +11282*a(n-12) +1603*a(n-13) -5660*a(n-14) -606*a(n-15) +1351*a(n-16) +86*a(n-17) -120*a(n-18) for n>19