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 A221277 Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with every occupancy equal to zero or two 0
 0, 0, 0, 100, 0, 0, 0, 46656, 0, 0, 0, 27836176, 0, 0, 0, 17029206016, 0, 0, 0, 10443393677376, 0, 0, 0, 6406089127650304, 0, 0, 0, 3929655953461248256, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Row 3 of A221275 LINKS EXAMPLE Some solutions for n=4 ..0..2..2..0....0..2..0..0....0..2..2..0....0..2..2..0....2..0..2..0 ..0..2..0..0....0..2..2..2....0..2..2..0....0..2..2..2....0..2..2..0 ..2..0..2..2....2..0..2..0....2..0..0..2....2..0..0..0....0..2..0..2 CROSSREFS Sequence in context: A010114 A287284 A015068 * A287631 A282142 A283010 Adjacent sequences:  A221274 A221275 A221276 * A221278 A221279 A221280 KEYWORD nonn AUTHOR R. H. Hardin Jan 09 2013 STATUS approved

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Last modified October 20 12:47 EDT 2019. Contains 328257 sequences. (Running on oeis4.)