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 A128136 #7 Feb 15 2022 11:12:07 %S A128136 1,1,4,2,4,9,3,6,9,16,4,8,12,16,25,5,10,15,20,25,36,6,12,18,24,30,36, %T A128136 49,7,14,21,28,35,42,49,64,8,16,24,32,40,48,56,64,81,9,18,27,36,45,54, %U A128136 63,72,81,100 %N A128136 A128132 * A002260. %C A128136 Row sums = A006003: (1, 5, 15, 34, 65, ...). %C A128136 A002260 * A128132 = A128137. %F A128136 A128132 * A002260 as infinite lower triangular matrices. %e A128136 First few rows of the triangle: %e A128136 1; %e A128136 1, 4; %e A128136 2, 4, 9; %e A128136 3, 6, 9, 16; %e A128136 4, 8, 12, 16, 25; %e A128136 5, 10, 15, 20, 25, 36; %e A128136 6, 12, 18, 24, 30, 36, 49; %e A128136 ... %Y A128136 Cf. A128132, A002260, A006003, A128137. %K A128136 nonn,tabl %O A128136 1,3 %A A128136 _Gary W. Adamson_, Feb 16 2007