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A221306 Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with every occupancy equal to zero or two 1
1, 31, 312, 3334, 38146, 431474, 4855258, 54587829, 613235478, 6885012344, 77275657244, 867163601744, 9729984671155, 109168050158528, 1224793149317547, 13741066811792010, 154160315091605934, 1729503583940965893 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A221308

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..39

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A212235 A126552 A068813 * A142382 A137318 A182025

Adjacent sequences:  A221303 A221304 A221305 * A221307 A221308 A221309

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 09 2013

STATUS

approved

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Last modified November 11 18:50 EST 2019. Contains 329031 sequences. (Running on oeis4.)