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A221426 Number of nX3 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without consecutive moves in the same direction 1
0, 42, 236, 4390, 46288, 622615, 7432234, 93888241, 1152556808, 14353368646, 177428523106, 2201695708298, 27265977663320, 338018668912390, 4188131487955190, 51907066789018822, 643229257269298586 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A221429

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..58

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A221523 A263304 A116004 * A122242 A046655 A299717

Adjacent sequences:  A221423 A221424 A221425 * A221427 A221428 A221429

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 15 2013

STATUS

approved

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Last modified August 25 04:05 EDT 2019. Contains 326318 sequences. (Running on oeis4.)