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 A190495 #8 Jul 01 2017 02:16:06 %S A190495 7,12,19,24,36,41,48,53,65,70,77,82,89,94,106,111,118,123,135,140,147, %T A190495 152,164,176,181,188,193,205,210,217,222,234,239,246,251,258,263,275, %U A190495 280,287,292,304,309,316,321,328,333,345,350,357,362,374,379,386,391,403,408,415,420 %N A190495 Positions of 3 in A190491. %C A190495 See A190492. %H A190495 G. C. Greubel, <a href="/A190495/b190495.txt">Table of n, a(n) for n = 1..1000</a> %t A190495 (See A190491.) %Y A190495 Cf. A190491. %K A190495 nonn %O A190495 1,1 %A A190495 _Clark Kimberling_, May 11 2011