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A221509 Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without consecutive moves in the same direction 0
0, 64, 664, 31663, 730874, 22664752, 617892584, 17782943460, 499912745268, 14194927933912, 401323009766448, 11367289765226164, 321716709992052606, 9108319376609834007, 257833317722010551358, 7299063007433073641077 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A221507

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A297666 A269586 A269080 * A283337 A187620 A119287

Adjacent sequences:  A221506 A221507 A221508 * A221510 A221511 A221512

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 18 2013

STATUS

approved

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Last modified December 6 09:25 EST 2019. Contains 329791 sequences. (Running on oeis4.)