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 A236266 Lexicographically earliest sequence of nonnegative integers such that no three points (i,a(i)), (j,a(j)), (n,a(n)) are collinear. 7
 0, 0, 1, 1, 4, 3, 8, 2, 2, 5, 7, 4, 5, 8, 16, 3, 7, 14, 12, 23, 16, 12, 25, 31, 13, 6, 11, 28, 11, 17, 9, 9, 22, 34, 6, 15, 13, 29, 23, 22, 29, 45, 26, 19, 51, 14, 24, 39, 28, 39, 18, 37, 57, 17, 38, 41, 15, 68, 32, 24, 66, 42, 10, 50, 27, 10, 53, 72, 25, 26 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 COMMENTS (a(n)-a(j))/(n-j) <> (a(j)-a(i))/(j-i) for all 0<=i(j-i)*(k-a(j)) od         od; if ok then return k fi       od     end: seq(a(n), n=0..60); MATHEMATICA a = a = 0; a[n_] := a[n] = Module[{i, j, k, ok}, For[k = 0, True, k++, ok = True; For[j = n-1, ok && j >= 1, j--, For[i = j-1, ok && i >= 0, i--, ok = (n-j)*(a[j]-a[i]) != (j-i)*(k-a[j])]]; If[ok, Return[k]]]]; Table[a[n], {n, 0, 70}] (* Jean-François Alcover, Jun 16 2018, after Alois P. Heinz *) CROSSREFS Cf. A005836, A179040, A231334, A236335, A255708, A255709. Sequence in context: A155910 A199077 A016703 * A099289 A231892 A065628 Adjacent sequences:  A236263 A236264 A236265 * A236267 A236268 A236269 KEYWORD nonn,look AUTHOR Alois P. Heinz, Jan 21 2014 STATUS approved

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Last modified June 16 16:09 EDT 2021. Contains 345063 sequences. (Running on oeis4.)