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 A030309 #10 Mar 30 2020 18:15:25 %S A030309 0,2,6,7,10,12,18,19,20,23,24,26,28,32,34,35,39,42,50,51,52,53,56,57, %T A030309 58,60,62,63,67,68,70,71,73,76,78,80,83,88,90,91,92,96,97,100,102,107, %U A030309 110,111,116,120,130,131,132,133,134,137,138,139 %N A030309 Position of n-th 0 in A030308. %K A030309 nonn %O A030309 1,2 %A A030309 _Clark Kimberling_ %E A030309 Initial 0 inserted for consistency with change in A030308 by _Sean A. Irvine_, Mar 30 2020