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 A231058 Number of n X 3 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero. 1
 0, 6, 34, 208, 1272, 7818, 47998, 294832, 1810916, 11123242, 68322370, 419657160, 2577663664, 15832804586, 97249963694, 597339237368, 3669041620356, 22536383966338, 138425413185266, 850251533001856, 5222506855786032 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 3 of A231063. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 8*a(n-1) -9*a(n-2) -20*a(n-3) +29*a(n-4) +22*a(n-5) -23*a(n-6) -14*a(n-7) -14*a(n-8) +4*a(n-9) +2*a(n-10). EXAMPLE Some solutions for n=4 ..0..3..0....0..3..2....0..1..2....0..3..2....0..3..2....0..1..2....0..3..2 ..1..2..1....1..2..1....1..0..3....1..2..1....1..2..1....3..0..3....1..0..3 ..2..3..0....0..1..0....2..3..2....2..1..0....0..3..0....2..1..0....2..3..2 ..1..2..3....3..0..3....1..0..1....3..0..3....3..2..1....3..0..3....1..2..1 CROSSREFS Cf. A231063. Sequence in context: A244829 A059228 A079568 * A317178 A218893 A266431 Adjacent sequences: A231055 A231056 A231057 * A231059 A231060 A231061 KEYWORD nonn AUTHOR R. H. Hardin, Nov 03 2013 STATUS approved

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Last modified June 5 05:23 EDT 2023. Contains 363130 sequences. (Running on oeis4.)