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A221418
Number of nX7 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two
1
0, 696, 0, 2026142, 0, 6079373768, 0, 18276976590202, 0, 54950038339359640, 0, 165205902731001266892, 0, 496685395180484146016942, 0, 1493264942493018550037435988, 0, 4489441162093631430608332402302, 0
OFFSET
1,2
COMMENTS
Column 7 of A221419
LINKS
EXAMPLE
Some solutions for n=4
..0..2..0..2..0..2..0....0..2..2..2..0..0..0....0..2..2..0..0..2..0
..0..2..2..2..2..2..0....0..0..2..2..2..2..2....0..0..2..2..2..2..2
..0..0..2..2..0..0..2....0..2..0..2..0..0..2....0..2..2..2..0..0..0
..0..2..0..0..2..0..2....0..0..2..0..2..2..0....0..0..0..0..2..2..2
CROSSREFS
Sequence in context: A214165 A048925 A251367 * A157435 A048426 A209731
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 15 2013
STATUS
approved