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 A190697 #8 Jun 04 2020 08:16:58 %S A190697 4,8,12,15,19,23,27,30,34,38,45,49,53,56,60,64,68,71,75,79,83,86,90, %T A190697 94,101,105,109,112,116,120,124,127,131,135,139,142,146,150,157,161, %U A190697 165,168,172,176,180,183,187,191,198,202,206,209,213,217,221,224,228,232,236,239,243,247,254,258,262,265,269,273,277,280,284,288 %N A190697 Positions of 3 in A190693. %C A190697 See A190693. %t A190697 (See A190693.) %Y A190697 Cf. A190693. %K A190697 nonn %O A190697 1,1 %A A190697 _Clark Kimberling_, May 17 2011