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 A217341 Number of nX3 arrays of occupancy after each element moves to some horizontal or vertical neighbor but without 2-loops 1
 0, 7, 144, 2389, 37114, 561573, 8399702, 124988061, 1855434240, 27513859347, 407794083248, 6042695120617, 89531233299098, 1326469665327327, 19652162517014150, 291151404103798147, 4313455938625144092 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 3 of A217346 LINKS R. H. Hardin, Table of n, a(n) for n = 1..53 FORMULA Empirical: a(n) = 23*a(n-1) -125*a(n-2) +13*a(n-3) +648*a(n-4) -208*a(n-5) -1279*a(n-6) +327*a(n-7) +1739*a(n-8) -1293*a(n-9) +138*a(n-10) +130*a(n-11) +8*a(n-12) EXAMPLE Some solutions for n=3 ..0..0..0....1..2..1....0..2..1....1..1..0....0..0..0....1..1..1....0..0..0 ..2..2..2....1..0..1....1..2..1....2..2..0....2..3..1....2..1..2....1..3..2 ..1..1..1....1..1..1....1..1..0....1..2..0....1..2..0....1..0..0....0..2..1 CROSSREFS Sequence in context: A286398 A104240 A263599 * A156978 A163028 A367527 Adjacent sequences: A217338 A217339 A217340 * A217342 A217343 A217344 KEYWORD nonn AUTHOR R. H. Hardin Oct 01 2012 STATUS approved

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Last modified June 13 17:32 EDT 2024. Contains 373391 sequences. (Running on oeis4.)