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 A031322 #4 Mar 30 2012 18:56:23 %S A031322 5,15,25,35,45,55,65,75,85,86,88,90,92,94,95,110,125,140,155,170,185, %T A031322 200,215,230,232,235,238,241,244,245,260,275,290,305,320,335,350,365, %U A031322 380,382,385,388,391,394,395,410,425,440,455 %N A031322 Position of n-th 9 in A031312. %K A031322 nonn %O A031322 1,1 %A A031322 _Clark Kimberling_