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 A189670 #4 Mar 30 2012 18:57:25 %S A189670 2,4,8,10,14,17,20,22,26,28,32,35,38,40,44,47,49,53,56,58,62,64,68,71, %T A189670 74,76,80,82,86,89,92,94,98,101,103,107,110,112,116,118,122,125,128, %U A189670 130,134,137,139,143,145,149,152,155,157,161,164,166,170,172,176,179,182,184,188,190,194,197,200,202,206,209,211,215,218,220,224,226,230,233,236,238,242 %N A189670 Positions of 1 in A189668; complement of A189669. %C A189670 See A189668. %t A189670 (See A189668.) %Y A189670 Cf. A189668, A189669, A189671. %K A189670 nonn %O A189670 1,1 %A A189670 _Clark Kimberling_, Apr 25 2011