A229367 Number of nX3 0..2 arrays avoiding 11 horizontally, 22 vertically and 00 antidiagonally.

22, 184, 1610, 13937, 122497, 1067299, 9346997, 81633583, 713982837, 6240061504, 54556988152, 476904755485, 4169201095109, 36446367090562, 318614423423484, 2785298770230012, 24348966185185668, 212857075051476381

Offset: 1

Author

R. H. Hardin Sep 21 2013

Keywords

• nonn

Comments

Column 3 of A229372

Examples

			Some solutions for n=4
..0..2..0....1..0..1....0..1..2....0..2..2....1..0..2....0..0..1....1..0..0
..0..1..2....2..2..0....1..0..1....0..1..0....2..0..1....2..0..1....1..2..1
..1..2..1....0..1..0....1..2..1....0..2..2....1..2..1....1..0..1....2..1..0
..2..0..2....0..2..1....0..0..2....0..0..1....1..0..2....2..2..1....0..2..1
		

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +61*a(n-2) +48*a(n-3) -586*a(n-4) -158*a(n-5) +2199*a(n-6) -1140*a(n-7) -1304*a(n-8) +440*a(n-9) +416*a(n-10) +64*a(n-11)