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 A133695 #8 Jul 29 2019 19:40:01 %S A133695 1,-3,-3,-1,-3,1,-3,-1,-1,1,-3,-1,-3,1,1,-1,-3,-1,-3,-1,1,1,-3,-1,-1, %T A133695 1,-1,-1,-3,-3,-3,-1,1,1,1,-1,-3,1,1,-1,-3,-3,-3,-1,-1,1,-3,-1,-1,-1, %U A133695 1,-1,-3,-1,1,-1,1,1,-3,-1,-3,1,-1,-1,1,-3,-3,-1,1,-3,-3,-1,-3,1,-1,-1 %N A133695 a(n) = 2*A008683 - 1. %F A133695 a(n) = 2*A008683 - 1, where A008683 = the Mobius sequence. %e A133695 a(5) = -3 = 2*(-1) - 1. %Y A133695 Cf. A008683. %K A133695 sign %O A133695 1,2 %A A133695 _Gary W. Adamson_, Sep 20 2007 %E A133695 More terms from _Petros Hadjicostas_, Jul 29 2019