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A221380 Number of nX6 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two 0
0, 16, 0, 1156, 0, 120409, 0, 13075456, 0, 1425817600, 0, 155542683321, 0, 16968863171584 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 6 of A221381

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A221271 A198804 A274377 * A221759 A111979 A309984

Adjacent sequences:  A221377 A221378 A221379 * A221381 A221382 A221383

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 14 2013

STATUS

approved

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Last modified January 29 16:58 EST 2020. Contains 331347 sequences. (Running on oeis4.)