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 A231334 Lexicographically earliest sequence of distinct positive integers such that for any distinct i,j, k, the points at positions (i, a(i)), (j, a(j)), (k, a(k)) are not aligned. 7
 1, 2, 4, 3, 6, 5, 9, 12, 7, 14, 13, 8, 23, 17, 18, 22, 10, 15, 11, 28, 19, 16, 20, 29, 32, 44, 35, 39, 24, 40, 26, 37, 42, 21, 56, 64, 43, 31, 25, 34, 27, 33, 66, 67, 52, 60, 30, 57, 36, 63, 86, 82, 38, 50, 47, 69, 75, 79, 89, 49, 45, 76, 41, 48, 98, 77, 94 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Is this a permutation of the natural numbers? There are only two fixed points: 1 and 2. LINKS Paul Tek, Table of n, a(n) for n = 1..10000 Paul Tek, C program for this sequence Illustrations of the first 200 points at positions (n, a(n)) (black pixels correspond to these points, colored pixels (x,y) are aligned with two black pixels (i,a(i)) and (j,a(j))): (1) x < i < j, (2) i < x < j, (3) i < j < x. PROG (C) See Link section. CROSSREFS Cf. A175498, A236266, A236335, A300002. Sequence in context: A113321 A271647 A232643 * A253609 A300002 A082560 Adjacent sequences:  A231331 A231332 A231333 * A231335 A231336 A231337 KEYWORD nonn AUTHOR Paul Tek, Nov 07 2013 STATUS approved

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Last modified October 22 07:48 EDT 2019. Contains 328315 sequences. (Running on oeis4.)