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 A190493 #8 Jul 01 2017 02:16:22 %S A190493 1,3,6,8,13,15,18,20,23,25,30,32,35,37,42,44,47,49,54,56,59,61,64,66, %T A190493 71,73,76,78,83,85,88,90,93,95,100,102,105,107,112,114,117,119,124, %U A190493 129,131,134,136,141,143,146,148,153,155,158,160,163,165,170,172,175,177,182,184,187,189,194,199,201,204,206,211,213,216,218,223 %N A190493 Positions of 1 in A190491. %C A190493 (See A190492.) %H A190493 G. C. Greubel, <a href="/A190493/b190493.txt">Table of n, a(n) for n = 1..1000</a> %t A190493 (See A190492.) %Y A190493 Cf. A190491. %K A190493 nonn %O A190493 1,2 %A A190493 _Clark Kimberling_, May 11 2011