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 A189630 #10 Oct 02 2019 01:21:07 %S A189630 3,6,8,12,15,17,21,23,27,30,33,35,39,42,44,48,50,54,57,60,62,66,68,72, %T A189630 75,78,80,84,87,89,93,96,98,102,104,108,111,114,116,120,123,125,129, %U A189630 131,135,138,141,143,147,149,153,156,159,161,165,168,170,174,177,179,183,185,189,192,195,197,201,203,207,210,213,215,219,222,224,228,231,233,237,239,243 %N A189630 Positions of 1 in A189628; complement of A189629. %C A189630 See A189628. %t A189630 (See A189628.) %Y A189630 Cf. A189628, A189629, A189631. %K A189630 nonn %O A189630 1,1 %A A189630 _Clark Kimberling_, Apr 24 2011 %E A189630 Name corrected by _Michel Dekking_, Oct 01 2019