A232024 Number of 2 X n 0..2 arrays with no element less than a strict majority of its horizontal and antidiagonal neighbors.

9, 22, 66, 212, 716, 2447, 8312, 28118, 95066, 321480, 1087248, 3677451, 12439185, 42076051, 142321098, 481394558, 1628298753, 5507667897, 18629517012, 63013782841, 213142264885, 720947466146, 2438583756862, 8248438798128

Offset: 1

Author

R. H. Hardin, Nov 17 2013

Keywords

• nonn

Comments

Row 2 of A232023.

Examples

			Some solutions for n=7
..0..0..0..0..0..0..0....1..1..0..0..1..1..2....2..1..1..1..0..0..0
..1..1..2..2..1..0..0....1..0..0..1..1..1..1....1..1..1..0..0..1..2
		

Links

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

Crossrefs

Cf. A232023.

Formula

Empirical: a(n) = 9*a(n-1) -36*a(n-2) +97*a(n-3) -202*a(n-4) +329*a(n-5) -437*a(n-6) +459*a(n-7) -407*a(n-8) +291*a(n-9) -161*a(n-10) +74*a(n-11) -4*a(n-12) +4*a(n-13) +15*a(n-14) +2*a(n-15) +3*a(n-16) +a(n-17) for n>18.