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 A143311 #2 Mar 30 2012 17:25:31 %S A143311 1,4,2,9,0,3,16,8,0,4,25,0,0,0,5,36,18,12,0,0,6,49,0,0,0,0,0,7,64,32, %T A143311 0,16,0,0,0,8,81,0,27,0,0,0,0,0,9,100,50,0,0,20,0,0,0,0,10,121,0,0,0, %U A143311 0,0,0,0,0,0,11,144,72,48,36,0,24,0,0,0,0,0,12,169,0,0,0,0,0,0,0,0,0,0,0,13 %N A143311 Triangle read by rows, A127648 * A126988; 1<=k<=n. %C A143311 Row sums = A064987, n*sigma(n): (1, 6, 12, 28, 30, 72, 56,...). %F A143311 Triangle read by rows, A127648 * A126988; 1<=k<=n %e A143311 First few rows of the triangle = %e A143311 1; %e A143311 4, 2; %e A143311 9, 0, 3; %e A143311 16, 8, 0, 4; %e A143311 25, 0, 0, 0, 5; %e A143311 36, 18, 12, 0, 0, 6; %e A143311 49, 0, 0, 0, 0, 0, 7; %e A143311 64, 32, 0, 16, 0, 0, 0, 8; %e A143311 ... %Y A143311 Cf. A127648, A126988, A064987. %K A143311 nonn,tabl %O A143311 1,2 %A A143311 _Gary W. Adamson_, Aug 06 2008