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 A174889 #7 Jan 14 2017 09:34:47 %S A174889 1,0,0,1,0,1,0,1,1,1,0,1,0,1,1,1,0,1,0,1,1,1,0,1,1,1,1,1,0,0,0,1,1,1, %T A174889 1,1,0,1,1,1,0,0,0,1,1,1,0,1,1,1,1,1,0,1,1,1,1,1,0,1,0,1,1,1,1,0,0,1, %U A174889 1,0,0,1,0,1,1,1,1 %N A174889 First column of A174888. %C A174889 Begins to differ from A005171 at n=30. a(n) is either 1 or 0. The value is chosen so that row sums in A174888 are equal to the Mobius function A008683, and row counts are equal to A074206. %Y A174889 Cf. A174888, A005171. %K A174889 nonn %O A174889 1,1 %A A174889 _Mats Granvik_, Apr 01 2010