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A221811 Number of 3Xn arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns 1
0, 41, 154, 3906, 32636, 486331, 5202774, 66756344, 772945086, 9475253764, 112494210565, 1359628053466, 16269612307575, 195771981733605, 2348419076818492, 28219682481306224, 338773827925545799 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A221809

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..96

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A142630 A259835 A082252 * A105100 A141988 A347075

Adjacent sequences:  A221808 A221809 A221810 * A221812 A221813 A221814

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 26 2013

STATUS

approved

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Last modified October 22 16:09 EDT 2021. Contains 348174 sequences. (Running on oeis4.)