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A222091

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

8, 306, 11698, 439979, 16518325, 620167586, 23285438194, 874320487561, 32829136547878, 1232675333611674, 46284755942965861, 1737909791864677612, 65255401994426759727, 2450223514629565888639, 92001505833953763778608

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 3 of A222093

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..55

EXAMPLE

Some solutions for n=3

..0..1..1....1..0..1....0..1..2....0..2..0....0..1..1....1..0..0....0..0..1

..1..0..3....2..3..0....0..1..2....4..0..0....0..2..1....1..3..0....3..1..1

..0..2..1....0..2..0....0..1..2....0..0..3....2..0..2....0..3..1....0..2..1