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 A031334 #6 Jun 22 2021 14:30:46 %S A031334 15,28,33,49,76,79,95,108,115,130,139,154,160,166,190,194,200,218,231, %T A031334 235,251,263,271,288,295,296,303,321,350,356,363,366,367,389,402,411, %U A031334 427,438,465,475,506,513,514,517,520,523,527 %N A031334 Position of n-th 9 in A031324. %Y A031334 Cf. A031324. %K A031334 nonn %O A031334 1,1 %A A031334 _Clark Kimberling_