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A221553 Number of 3Xn arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out left turns 1
2, 71, 1930, 48018, 1200093, 29961271, 747830157, 18664821555, 465841969135, 11626559958154, 290177113520981, 7242272238158273, 180753392894785450, 4511261939241006332, 112592541470281392840, 2810096262246752615123 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A221551

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..85

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A202813 A081368 A221959 * A071871 A055030 A185120

Adjacent sequences:  A221550 A221551 A221552 * A221554 A221555 A221556

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 19 2013

STATUS

approved

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Last modified June 5 18:48 EDT 2020. Contains 334854 sequences. (Running on oeis4.)