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 A190559 #8 Jun 04 2020 06:41:03 %S A190559 4,9,11,16,21,26,28,33,38,40,45,50,55,57,62,67,69,74,79,81,86,91,96, %T A190559 98,103,108,110,115,120,125,127,132,137,139,144,149,151,154,156,161, %U A190559 166,168,173,178,180,185,190,195,197,202,207,209,214,219,224,226,231,236,238,243,248,250,255,260,265,267,272,277,279,284,289,294 %N A190559 Positions of 3 in A190555. %C A190559 See A190555. %t A190559 (See A190555.) %Y A190559 Cf. A190555. %K A190559 nonn %O A190559 1,1 %A A190559 _Clark Kimberling_, May 12 2011