A232138 Number of (1+1) X (n+1) 0..2 arrays with no element equal to a strict majority of its horizontal and antidiagonal neighbors, with values 0..2 introduced in row major order.

6, 36, 200, 1140, 6468, 36752, 208772, 1186044, 6737864, 38277700, 217454804, 1235356496, 7018035732, 39869322348, 226496831848, 1286724024020, 7309853741220, 41527134586384, 235914830581476, 1340227488431516

Offset: 1

Author

R. H. Hardin, Nov 19 2013

Keywords

• nonn

Examples

			Some solutions for n=6:
..0..1..2..0..2..1..0....0..1..0..1..2..0..1....0..1..2..2..0..1..0
..2..1..1..2..1..2..1....2..0..1..0..1..0..1....2..0..0..1..2..2..1
		

Links

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

Crossrefs

Row 1 of A232137.

Formula

Empirical: a(n) = 6*a(n-1) - 11*a(n-3) + 4*a(n-4).

Empirical g.f.: 2*x*(3 - 8*x^2 + 3*x^3) / (1 - 6*x + 11*x^3 - 4*x^4). - Colin Barker, Oct 03 2018