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A221407 Number of nX6 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two 0
8, 328, 12668, 492102, 18852560, 722442370, 27665242848, 1058237377670 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A221408

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=3

..0..0..2..0..2..2....0..0..2..2..0..2....2..2..0..2..0..2....2..0..0..0..2..0

..2..0..0..2..0..0....2..0..2..0..0..2....2..0..0..2..0..0....2..2..2..2..2..0

..2..0..2..2..0..2....0..2..2..0..0..2....0..2..2..0..2..0....0..0..2..0..0..2

CROSSREFS

Sequence in context: A344094 A264053 A300613 * A204069 A226551 A285370

Adjacent sequences:  A221404 A221405 A221406 * A221408 A221409 A221410

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 15 2013

STATUS

approved

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Last modified June 21 19:12 EDT 2021. Contains 345365 sequences. (Running on oeis4.)