A221926 Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns.

6, 232, 5748, 153652, 4053833, 107220027, 2834169558, 74925759485, 1980733759947, 52362769529788, 1384263535086577, 36594432454954146, 967411477937300180, 25574518045138377146, 676088703977133126785

Offset: 1

Author

R. H. Hardin Feb 01 2013

Keywords

• nonn

Comments

Column 3 of A221929

Examples

			Some solutions for n=3
..0..2..0....0..1..1....1..2..0....0..3..0....0..4..1....0..1..1....0..2..1
..0..1..1....1..3..0....1..2..1....0..2..1....0..1..0....0..5..0....0..2..2
..2..2..1....2..1..0....1..1..0....0..1..2....1..1..1....2..0..0....0..1..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..41