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 A030731 #10 Apr 09 2020 02:09:45 %S A030731 3,5,6,7,9,12,15,18,21,24,27,30,32,34,37,41,44,50,54,58,62,65,68,72, %T A030731 78,82,85,90,96,100,106,110,113,117,123,128,134,138,140,145,149,155, %U A030731 161,167,170,174,179,183,190,197,202,208,214,219,226,231,235,241,248 %N A030731 Record values in A030727. %Y A030731 Cf. A030727, A030732. %K A030731 nonn %O A030731 1,1 %A A030731 _Clark Kimberling_ %E A030731 More terms and simpler title from _Sean A. Irvine_, Apr 08 2020