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 A143353 #2 Mar 30 2012 17:25:31 %S A143353 1,3,-1,3,0,-1,6,-3,0,0,3,0,0,0,-1,9,-3,-3,0,0,1,3,0,0,0,0,0,-1,10,-6, %T A143353 0,0,0,0,0,0,6,0,-3,0,0,0,0,0,0,9,-3,0,0,-3,0,0,0,0,1,3,0,0,0,0,0,0,0, %U A143353 0,0,-1,18,-9,-6,0,0,3,0,0,0,0,0,0,3,0,0,0,0,0,0,0,0,0,0,0,-1,9,-3,0,0,0,0,-3,0,0,0,0,0,0,1 %N A143353 Triangle read by rows, A127172 * A128407 = (A051731)^3 * A128407, 1<=k<=n. %C A143353 Left border = A007425. %C A143353 Right border = mu(n), A008683. %C A143353 Row sums = d(n), A000010: (1, 2, 2, 3, 2, 4, 2,...). %F A143353 Triangle read by rows, A127172 * A128407 = (A051731)^3 * A128407, 1<=k<=n %e A143353 First few rows of the triangle = %e A143353 1; %e A143353 3, -1; %e A143353 3, 0, -1; %e A143353 6, -3, 0, 0; %e A143353 3, 0, 0, 0, -1; %e A143353 9, -3, -3, 0, 0, 1; %e A143353 3, 0, 0, 0, 0, 0, -1; %e A143353 10, -6, 0, 0, 0, 0, 0, 0; %e A143353 6, 0, -3, 0, 0, 0, 0, 0, 0; %e A143353 9, -3, 0, 0, -3, 0, 0, 0, 0, 1; %e A143353 ... %Y A143353 Cf. A007425, A127172, A128407, A051731, A000010, A008683. %K A143353 tabl,sign %O A143353 1,2 %A A143353 _Gary W. Adamson_, Aug 10 2008