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 A128314 #4 Feb 18 2022 22:12:57 %S A128314 1,-1,1,-1,-1,1,-1,1,-2,1,-1,-3,4,-3,1,-1,3,-7,7,-4,1,-1,-3,8,-13,11, %T A128314 -5,1,-1,1,-10,21,-24,16,-6,1,-1,-5,17,-35,46,-40,22,-7,1,-1,7,-25,53, %U A128314 -81,86,-62,29,-8,1 %N A128314 Triangle, A000012 * A128313. %C A128314 Row sums = the Mertens sequence: A002321, (1, 0, -1, -1, -2, ...). %F A128314 A000012 * A128313 as infinite lower triangular matrices. %e A128314 First few rows of the triangle: %e A128314 1; %e A128314 -1, 1; %e A128314 -1, -1, 1; %e A128314 -1, 1, -2, 1 %e A128314 -1, -3, 4, -3, 1; %e A128314 -1, 3, -7, 7, -4, 1; %e A128314 -1, -3, 8, -13, 11, -5, 1; %e A128314 ... %Y A128314 Cf. A128313, A000012, A002321. %K A128314 tabl,sign %O A128314 1,9 %A A128314 _Gary W. Adamson_, Feb 25 2007