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 A232936 Number of n X 3 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, vertically or antidiagonally. 1
 12, 26, 84, 252, 774, 2360, 7212, 22024, 67272, 205466, 627562, 1916768, 5854418, 17881234, 54614930, 166811210, 509494028, 1556155380, 4752989126, 14517127208, 44339883148, 135427981664, 413639750856, 1263386202642, 3858779756370 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = a(n-1) + 5*a(n-2) + 4*a(n-3) - a(n-5) for n>6. Empirical g.f.: 2*x*(6 + 7*x - x^2 - 5*x^3 - x^4 + x^5) / ((1 + x)*(1 - 2*x - 3*x^2 - x^3 + x^4)). - Colin Barker, Oct 06 2018 EXAMPLE Some solutions for n=5: ..0..0..1....2..2..2....2..1..2....0..0..0....1..2..1....2..2..1....2..2..2 ..0..0..0....2..2..2....2..2..1....0..0..0....2..2..2....1..2..2....2..2..1 ..0..0..0....1..2..1....2..2..2....0..1..0....2..2..2....2..1..2....1..2..2 ..0..0..0....2..2..2....1..2..2....0..0..1....2..2..2....2..2..1....2..2..2 ..0..1..0....1..2..2....2..1..2....0..0..0....1..2..2....2..2..2....2..2..2 CROSSREFS Column 3 of A232941. Sequence in context: A105814 A297427 A211115 * A274897 A030736 A227854 Adjacent sequences:  A232933 A232934 A232935 * A232937 A232938 A232939 KEYWORD nonn AUTHOR R. H. Hardin, Dec 02 2013 STATUS approved

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Last modified August 3 10:49 EDT 2020. Contains 336198 sequences. (Running on oeis4.)