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 A176702 #4 Mar 31 2012 20:08:10 %S A176702 1,0,1,1,-1,1,0,1,-1,1,1,0,0,-1,1,0,0,1,0,-1,1,1,0,0,0,0,-1,1,0,1,-1, %T A176702 1,0,0,-1,1,1,-1,1,0,0,0,0,-1,1,0,1,0,-1,1,0,0,0,-1,1,1,0,0,0,0,0,0,0, %U A176702 0,-1,1,0,0,0,1,-1,1,0,0,0,0,-1,1,1,0,0,0,0,0,0,0,0,0,0,-1,1,0,1,0,0,0,-1 %N A176702 Triangle T(n,k) read by rows. A051731(n,k)-A051731(n,k+1). %C A176702 Matrix inverse of A134541. %C A176702 The subsequence of A180430 beginning from the second column, divided by 2, equals this sequence. [From _Mats Granvik_, Sep 04 2010] %e A176702 Triangle begins: %e A176702 1 %e A176702 0...1 %e A176702 1..-1...1 %e A176702 0...1..-1...1 %e A176702 1...0...0..-1...1 %e A176702 0...0...1...0..-1...1 %e A176702 1...0...0...0...0..-1...1 %e A176702 0...1..-1...1...0...0..-1...1 %e A176702 1..-1...1...0...0...0...0..-1...1 %e A176702 0...1...0..-1...1...0...0...0..-1...1 %e A176702 1...0...0...0...0...0...0...0...0..-1...1 %e A176702 0...0...0...1..-1...1...0...0...0...0..-1...1 %Y A176702 Cf. A176702*A000012=A051731. Row sums equals A000012. %K A176702 sign,tabl %O A176702 1,1 %A A176702 Mats Granvik, _Gary W. Adamson_, Apr 24 2010