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 A239031 Number of 4 X n 0..2 arrays with no element equal to the sum of elements to its left or one plus the sum of the elements above it, modulo 3. 1
 4, 11, 28, 59, 110, 189, 306, 473, 704, 1015, 1424, 1951, 2618, 3449, 4470, 5709, 7196, 8963, 11044, 13475, 16294, 19541, 23258, 27489, 32280, 37679, 43736, 50503, 58034, 66385, 75614, 85781, 96948, 109179, 122540, 137099, 152926, 170093, 188674 (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) = (1/12)*n^4 - (1/6)*n^3 + (47/12)*n^2 - (29/6)*n + 5. Conjectures from Colin Barker, Oct 25 2018: (Start) G.f.: x*(4 - 9*x + 13*x^2 - 11*x^3 + 5*x^4) / (1 - x)^5. a(n) = 5*a(n-1) - 10*a(n-2) + 10*a(n-3) - 5*a(n-4) + a(n-5) for n>5. (End) EXAMPLE Some solutions for n=5: ..2..0..0..0..0....2..0..0..0..0....2..0..0..0..0....2..0..0..0..0 ..2..0..0..0..0....1..0..2..2..0....1..0..0..0..2....2..0..0..0..0 ..1..0..0..0..0....2..0..1..1..2....2..0..0..0..1....1..0..2..2..0 ..1..0..0..0..2....1..2..2..0..1....1..0..0..0..2....2..0..1..2..0 CROSSREFS Row 4 of A239030. Sequence in context: A269076 A282641 A031127 * A289217 A329141 A090539 Adjacent sequences: A239028 A239029 A239030 * A239032 A239033 A239034 KEYWORD nonn AUTHOR R. H. Hardin, Mar 09 2014 STATUS approved

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Last modified June 3 09:49 EDT 2023. Contains 363107 sequences. (Running on oeis4.)