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 A087466 #9 May 23 2015 18:44:16 %S A087466 0,0,1,0,1,0,2,1,0,2,1,3,0,2,1,3,0,2,4,1,3,0,2,4,1,3,5,0,2,4,1,3,5,0, %T A087466 2,4,6,1,3,5,0,2,4,6,1,3,5,7,0,2,4,6,1,3,5,7,0,2,4,6,8,1,3,5,7,0,2,4, %U A087466 6,8,1,3,5,7,9,0,2,4,6,8,1,3,5,7,9,0,2,4,6,8,10,1,3,5,7,9,0,2,4,6,8,10,1,3 %N A087466 a(n) = number of the row (counting from initial row 0) of the array R in A087465 that contains n. %C A087466 A sequence that contains itself as a proper subsequence (infinitely many times); that is, a fractal sequence. %H A087466 Clark Kimberling and John E. Brown, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL7/Kimberling/kimber67.html">Partial Complements and Transposable Dispersions</a>, J. Integer Seqs., Vol. 7, 2004. %e A087466 Northwest corner of R: %e A087466 1 2 4 6 9 %e A087466 3 5 8 11 15 %e A087466 7 10 14 18 23 %e A087466 12 16 21 26 32 %e A087466 19 24 30 36 43 %e A087466 a(10)=2 because 10 is in row 2. %Y A087466 Cf. A087465, A087467. %K A087466 nonn %O A087466 1,7 %A A087466 _Clark Kimberling_, Sep 09 2003