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 A128189 #5 Feb 18 2022 22:06:35 %S A128189 1,-1,1,0,0,1,0,0,0,1,0,0,1,0,1,0,0,-1,1,0,1,0,0,1,0,1,0,1,0,0,0,0,0, %T A128189 1,0,1,0,0,0,0,1,0,1,0,1,0,0,-1,1,-1,1,0,1,0,1 %N A128189 Moebius transform of A128174. %C A128189 Row sums = A083290: (1, 0, 1, 1, 2, 1, 3, 2, 3, 2, ...). %F A128189 A054525 * A128174 as infinite lower triangular matrices. %e A128189 First few rows of the triangle: %e A128189 1; %e A128189 -1, 1; %e A128189 0, 0, 1; %e A128189 0, 0, 0, 1; %e A128189 0, 0, 1, 0, 1; %e A128189 ... %Y A128189 Cf. A051731, A128174, A083290. %K A128189 tabl,sign %O A128189 1,1 %A A128189 _Gary W. Adamson_, Feb 17 2007