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A221272
Number of nX4 arrays of occupancy after each element moves to some king-move neighbor, with every occupancy equal to zero or two
0
1, 52, 596, 7252, 94659, 1250015, 16474842, 217194702, 2863102280, 37731750319, 497133557199, 6548899949298, 86261110576994, 1136131886838454
OFFSET
1,2
COMMENTS
Column 4 of A221273
EXAMPLE
Some solutions for n=4
..0..2..2..0....0..2..0..2....0..2..2..2....0..2..2..0....0..2..2..2
..2..0..0..2....0..0..2..0....0..0..0..0....2..0..2..0....0..0..0..0
..0..2..2..0....2..2..0..2....2..0..2..0....0..2..0..2....0..2..2..2
..0..2..2..0....2..0..0..2....2..2..2..0....0..2..2..0....0..0..2..2
CROSSREFS
Sequence in context: A294055 A285753 A100413 * A254137 A249712 A255945
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 08 2013
STATUS
approved