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A221923 Number of nX3 arrays of occupancy after each element stays put or moves to some king-move neighbor, without move-in move-out straight through or left turns 0
6, 350, 13228, 508281, 19513309, 749481703, 28788205897, 1105748138634, 42471447510183, 1631315682219574 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A221925

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

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

..2..1..2....0..0..0....3..2..0....2..0..0....5..0..0....3..2..0....2..1..1

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

CROSSREFS

Sequence in context: A229501 A289738 A211089 * A000409 A214445 A059415

Adjacent sequences:  A221920 A221921 A221922 * A221924 A221925 A221926

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 31 2013

STATUS

approved

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Last modified September 19 05:33 EDT 2020. Contains 337176 sequences. (Running on oeis4.)