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 A117169 #6 Mar 30 2012 18:37:44
%S A117169 1,0,-1,-1,-2,-1,-2,0,-2,0,1,2,0,3,3,4,4,6,5,7,6,7,10,7,4,7,10,7,8,5,
%T A117169 7,6,6,1,5,0,-1,-2,-1,-8,-6,-11,-7,-15,-12,-20,-15,-24,-27,-33,-25,
%U A117169 -36,-28,-41,-39,-48,-42,-51,-46,-61,-61,-69,-58,-72,-64,-77,-70,-85,-76,-90,-85,-94,-86,-99,-84,-100
%N A117169 Row sums of triangle A117165 of Shift-Moebius transform coefficients and so equals the Shift-Moebius transform of [1,1,1,...].
%o A117169 (PARI) {a(n)=sum(j=1,n,prod(i=0,n+j-1,matrix(n+j-1,n+j-1,r,c,if(r>=c, if((r+n+j-1-i)%(c+n+j-1-i)==0,moebius((r+n+j-1-i)/(c+n+j-1-i)),0))))[n,j])}
%Y A117169 Cf. A117165 (triangle), A117166 (column 1), A117167 (column 2), A117168 (column 3); A117160.
%K A117169 sign
%O A117169 1,5
%A A117169 _Wouter Meeussen_ and _Paul D. Hanna_, Mar 05 2006