A221778 - OEIS

A221778

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 left turns

8, 258, 7676, 230621, 6911480, 207263892, 6215606652, 186396173357, 5589718833790, 167626605489419, 5026850431347057, 150747105072411113, 4520661588144287366, 135567321024902298286, 4065444442439149946284

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OFFSET

1,1

COMMENTS

Column 3 of A221780

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..52

EXAMPLE

Some solutions for n=3

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

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

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