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 A189658 #5 Mar 30 2012 18:57:25 %S A189658 1,2,4,5,9,10,11,13,14,18,21,24,25,26,28,29,31,32,36,37,38,40,41,45, %T A189658 48,51,52,53,57,60,61,62,66,69,70,71,73,74,76,77,81,82,83,85,86,90,91, %U A189658 92,94,95,99,102,105,106,107,109,110,112,113,117,118,119,121,122,126,129,132,133,134,138,141,142,143,147,150,151,152,154,155,157,158,162,165,168,169,170 %N A189658 Positions of 0 in A064990; complement of A189659. %C A189658 See A065990. %t A189658 (See A064990.) %Y A189658 Cf. A064990, A189659, A189660. %K A189658 nonn %O A189658 1,2 %A A189658 _Clark Kimberling_, Apr 25 2011