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 A190494 #12 Jul 01 2017 02:16:10 %S A190494 2,4,9,11,14,16,21,26,28,31,33,38,40,43,45,50,52,55,57,60,62,67,69,72, %T A190494 74,79,81,84,86,91,96,98,101,103,108,110,113,115,120,122,125,127,130, %U A190494 132,137,139,142,144,149,151,154,156,159,161,166,168,171,173,178,180,183,185,190,192,195,197,200,202,207,209,212,214,219 %N A190494 Positions of 2 in A190491. %C A190494 See A190491. %H A190494 G. C. Greubel, <a href="/A190494/b190494.txt">Table of n, a(n) for n = 1..1000</a> %t A190494 (See A190491.) %Y A190494 Cf. A190491. %K A190494 nonn %O A190494 1,1 %A A190494 _Clark Kimberling_, May 11 2011