A232298 Number of 4Xn 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally.

1, 355, 17759, 718483, 31119789, 1370434057, 60054788123, 2629547976059, 115168967578383, 5044363984412427, 220938351417726213, 9676874008509774099, 423837490846852109695, 18563663237964339458229, 813070077580205734910151

Offset: 1

Author

R. H. Hardin, Nov 22 2013

Keywords

• nonn

Comments

Row 4 of A232295

Examples

			Some solutions for n=3
..2..1..0....2..0..1....2..1..0....2..1..2....2..2..1....2..2..1....2..2..2
..0..2..2....2..2..0....2..0..2....2..2..1....1..2..1....0..1..2....2..2..0
..2..1..1....1..1..2....1..2..2....2..0..1....2..1..0....1..2..2....2..1..0
..2..2..1....1..2..1....1..1..0....2..2..1....0..2..1....2..2..1....2..2..2
		

Links

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