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 A143352 #2 Mar 30 2012 17:25:31 %S A143352 1,2,-1,2,0,-1,3,-2,0,0,2,0,0,0,-1,4,-2,-2,0,0,1,2,0,0,0,0,0,-1,4,-3, %T A143352 0,0,0,0,0,0,3,0,-2,0,0,0,0,0,0,4,-2,0,0,-2,0,0,0,0,1,2,0,0,0,0,0,0,0, %U A143352 0,0,-1,6,-4,-3,0,0,2,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,-1,4,-2,0,0,0,0,-2,0,0,0,0,0,0,1 %N A143352 Triangle read by rows, A051731 * A054524 = (A051731)^2 * A128407; 1<=k<=n. %C A143352 Left border = d(n), A000010. %C A143352 Right border = mu(n), A008683. %C A143352 Row sums = 1. %F A143352 Triangle read by rows, A051731 * A054524 = (A051731)^2 * A128407; 1<=k<=n %e A143352 First few rows of the triangle = %e A143352 1; %e A143352 2, -1; %e A143352 2, 0, -1; %e A143352 3, -2, 0, 0; %e A143352 2, 0, 0, 0, -1 %e A143352 4, -2, -2, 0, 0, 1; %e A143352 2, 0, 0, 0, 0, 0, -1; %e A143352 4, -3, 0, 0, 0, 0, 0, 0; %e A143352 3, 0, -2, 0, 0, 0, 0, 0, 0; %e A143352 4, -2, 0, 0, -2, 0, 0, 0, 0, 1; %e A143352 ... %Y A143352 Cf. A054524, A051731, A128407, A000010, A008683. %K A143352 tabl,sign %O A143352 1,2 %A A143352 _Gary W. Adamson_, Aug 10 2008