This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A359652 #16 Jan 10 2023 20:00:55 %S A359652 1,1,2,1,1,2,2,5,5,1,1,2,1,1,2,2,5,5,2,5,5,6,6,10,6,6,11,1,1,2,1,1,2, %T A359652 2,5,5,1,1,2,1,1,2,2,5,5,2,5,5,6,6,10,6,6,11,11,5,5,6,6,12,6,6,12,2, %U A359652 12,14,13,13,3,13,12,12,15,13,12,12,13,15,13,17 %N A359652 Lexicographically earliest sequence of positive integers such that no three terms a(j), a(j+k), a(j+2k) (for any j and k) form an arithmetic or geometric progression. %H A359652 Alois P. Heinz, <a href="/A359652/b359652.txt">Table of n, a(n) for n = 1..10000</a> %F A359652 a(n) <= (n^2+1)/2. %Y A359652 Cf. A229037, A268811. %K A359652 nonn,look %O A359652 1,3 %A A359652 _Neal Gersh Tolunsky_, Jan 09 2023 %E A359652 More terms from _Alois P. Heinz_, Jan 09 2023