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 A221271 Number of nX3 arrays of occupancy after each element moves to some king-move neighbor, with every occupancy equal to zero or two 0
 0, 16, 0, 596, 0, 24366, 0, 1001855, 0, 41171316, 0, 1691327788, 0, 69470653170, 0, 2853337539621, 0, 117191717993760, 0, 4813242705044572, 0, 197686734633818238, 0, 8119268451165592095, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 3 of A221273 LINKS Table of n, a(n) for n=1..25. EXAMPLE Some solutions for n=4 ..0..2..0....2..2..0....0..2..0....0..0..2....2..0..2....0..2..2....2..0..0 ..0..2..0....2..0..0....2..2..0....2..2..2....2..2..0....2..2..0....2..0..2 ..2..0..0....2..0..0....0..2..2....0..2..2....2..0..0....0..2..0....2..2..0 ..2..2..2....0..2..2....0..2..0....0..0..0....0..2..0....0..2..0....0..0..2 CROSSREFS Sequence in context: A221726 A221729 A219950 * A198804 A274377 A221380 Adjacent sequences: A221268 A221269 A221270 * A221272 A221273 A221274 KEYWORD nonn AUTHOR R. H. Hardin Jan 08 2013 STATUS approved

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Last modified September 16 12:57 EDT 2024. Contains 375976 sequences. (Running on oeis4.)