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 A134842 #7 Mar 27 2022 18:52:06 %S A134842 1,-1,0,-1,-1,0,0,-1,0,0,-1,-1,-1,-1,0,1,0,0,0,1,0,-1,-1,-1,-1,-1,-1, %T A134842 0,0,0,0,-1,0,0,0,0,0,0,-1,0,0,-1,0,0,0,1,0,1,0,0,0,1,0,1,0 %N A134842 Triangle, n-th row = first n terms of n-th row of an array formed by A054525 * A051731(transform). %C A134842 Left column = mu(n), A008683: (1, -1, -1, 0, -1, 1, 0, 0, 1, ...). %C A134842 Row sums = A023900: (1, -1, -2, -1, -4, 2, -6, ...). %F A134842 Triangle, n-th row - first n terms of n-th row of an array formed by A054525 * A051731(transform). %e A134842 First few rows of the array: %e A134842 1, 1, 1, 1, 1, 1, 1, ... %e A134842 -1, 0, -1, 0, -1, 0, -1, ... %e A134842 -1, -1, 0, -1, -1, -1, 0, ... %e A134842 0, -1, 0, 0, 0, -1, 0, ... %e A134842 -1, -1, -1, -1, -1, 0, -1, ... %e A134842 ... %e A134842 First few rows of the triangle: %e A134842 1; %e A134842 -1, 0; %e A134842 -1, -1, 0; %e A134842 0, -1, 0, 0; %e A134842 -1, -1, -1, -1, 0; %e A134842 1, 0, 0, 0, 1, 0; %e A134842 -1, -1, -1, -1, -1, -1, 0; %e A134842 ... %Y A134842 Cf. A051731, A054525, A008683, A023900. %K A134842 tabl,sign %O A134842 1,1 %A A134842 _Gary W. Adamson_, Nov 12 2007