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 A190449 #7 Jun 04 2020 06:40:48 %S A190449 1,6,11,14,19,22,24,27,32,35,40,45,48,53,56,61,66,69,74,79,82,87,90, %T A190449 95,100,103,108,111,113,116,121,124,129,134,137,142,145,150,155,158, %U A190449 163,168,171,176,179,184,189,192,197,200,202,205,210,213,218,223,226,231,234,239,244,247,252,255,257,260,265,268,273,278,281,286 %N A190449 Positions of 3 in A190445. %C A190449 See A190445. %t A190449 (See A190445.) %Y A190449 Cf. A190445. %K A190449 nonn %O A190449 1,2 %A A190449 _Clark Kimberling_, May 10 2011