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 A140508 #2 Mar 31 2012 14:45:10 %S A140508 0,2,3,0,5,-5,7,0,0,-7,11,0,13,-9,-8,0,17,0,19,0,-10,-13,23,0,0,-15,0, %T A140508 0,29,10,31,0,-14,-19,-12,0,37,-21,-16,0,41,12,43,0,0,-25,47,0,0,0, %U A140508 -20,0,53,0,-16,0,-22,-31,59,0,61,-33,0,0,-18,16,67,0,-26,14,71,0,73 %N A140508 Mobius transform applied twice to A001414. %C A140508 Mobius transform applied once to A120007. Except for first term and zero divided by zero, this sequence gives A008683 as: %C A140508 mu(n) = -a(n)/abs(a(n)) through the conjecture in A140254. %Y A140508 Cf. A120007, A001414, A008683, A140254. %K A140508 sign %O A140508 1,2 %A A140508 _Mats Granvik_, Jun 30 2008