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A221247 Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor 1
0, 64, 1056, 45369, 1337130, 44315649, 1404725868, 45215769600, 1447056039456, 46405605611556, 1487038748557464, 47664362071029636, 1527638149928473128, 48962472488029102500, 1569278944309473869112, 50296658362620611720256 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A221245

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..24

EXAMPLE

Some solutions for n=3

..0..3..1....0..0..0....0..0..1....0..1..0....0..1..0....0..1..2....2..4..0

..0..3..1....0..4..3....2..6..0....1..3..1....2..3..0....0..5..0....0..0..0

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

CROSSREFS

Sequence in context: A232958 A231952 A223018 * A280603 A301322 A300497

Adjacent sequences: A221244 A221245 A221246 * A221248 A221249 A221250

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 06 2013

STATUS

approved

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Last modified December 5 21:40 EST 2022. Contains 358594 sequences. (Running on oeis4.)