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 A055132 #6 Mar 31 2015 03:55:14 %S A055132 -1,1,-1,-1,0,0,1,-1,1,-1,-1,0,0,0,-1,0,-1,1,1,1,1,1,0,-1,0,-1,0,-1,1, %T A055132 1,0,-1,1,0,-1,1,-1,0,-1,0,0,0,-1,0,-1,1,0,-1,-1,1,-1,-1,1,1,1,1,0,0, %U A055132 0,0,0,-1,0,0,0,1,-1,-1,1,1,1,1,1,-1,0,-1,-1,-1,-1,0,1,0,1,0,0,0,-1,0,-1,0,1,1,-1,0,-1,0,0,1,0,0,0,1,0,1,-1 %N A055132 Moebius function (A008683) applied to each term in the triangle A055096. %p A055132 sum2distinct_squares_array := (n) -> (((n-((trinv(n-1)*(trinv(n-1)-1))/2))^2)+((trinv(n-1)+1)^2)); %p A055132 with(numtheory,mobius); a(n) = mobius(sum2distinct_squares_array(n)) %Y A055132 Cf. A055097. %K A055132 sign,tabl %O A055132 1,1 %A A055132 _Antti Karttunen_, Apr 04 2000