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 A190500 #8 Jul 01 2017 08:26:01 %S A190500 2,7,9,12,14,19,24,26,31,36,38,41,43,48,53,55,60,65,67,70,72,77,82,84, %T A190500 89,94,96,101,106,108,111,113,118,123,125,130,135,137,140,142,147,152, %U A190500 154,159,164,166,171,176,178,181,183,188,193,195,200,205,207,210,212,217,222,224,229,234,236,239,241,246,248,251,253,258,263 %N A190500 Positions of 3 in A190496. %C A190500 See A190496. %H A190500 G. C. Greubel, <a href="/A190500/b190500.txt">Table of n, a(n) for n = 1..1000</a> %t A190500 (See A190496.) %Y A190500 Cf. A190496. %K A190500 nonn %O A190500 1,1 %A A190500 _Clark Kimberling_, May 11 2011