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A221127 Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor 1
1, 144, 4872, 179300, 6405243, 229006550, 8187649472, 292733110656, 10466092166432, 374194374753326, 13378578012147801, 478324533007616827, 17101545371715018992, 611431849960750401963, 21860533596256955469254 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A221125

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..21

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A271672 A204390 A008376 * A262788 A319294 A233645

Adjacent sequences:  A221124 A221125 A221126 * A221128 A221129 A221130

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 02 2013

STATUS

approved

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Last modified April 16 10:51 EDT 2021. Contains 343037 sequences. (Running on oeis4.)