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A221549 Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out left turns 1
2, 72, 1930, 47976, 1196232, 29856238, 745144793, 18597229593, 464150326595, 11584303335876, 289122180321148, 7215940813826595, 180096192359343564, 4494859317429619337, 112183162016821282782, 2799878918782194289254 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A221551

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..150

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A070775 A157061 A179957 * A289197 A174582 A253316

Adjacent sequences:  A221546 A221547 A221548 * A221550 A221551 A221552

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 19 2013

STATUS

approved

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Last modified March 18 16:27 EDT 2019. Contains 321292 sequences. (Running on oeis4.)