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 A140583 #7 Aug 12 2022 15:13:52 %S A140583 1,2,1,3,1,1,2,2,1,1,5,1,1,1,1,1,4,2,1,1,1,7,1,1,1,1,1,1,2,2,2,2,1,1, %T A140583 1,1,3,3,3,1,1,1,1,1,1,1,6,2,2,2,1,1,1,1,1,11,1,1,1,1,1,1,1,1,1,1,1,1, %U A140583 4,4,2,2,1,1,1,1,1,1 %N A140583 Triangle read by rows, A140581 * A000012. %C A140583 Left column = A014963: (1, 2, 3, 2, 5, 1, 7, 2, 3, 1, 11, ...). %C A140583 Row sums = A140584: (1, 3, 5, 6, 9, 10, 13, ...). %F A140583 Triangle read by rows, A140581 * A000012; where A000012 = the infinite lower triangular matrix with all 1's and the rest zeros: [1; 1,1; 1,1,1; ...]. %e A140583 First few rows of the triangle: %e A140583 1; %e A140583 2, 1; %e A140583 3, 1, 1; %e A140583 2, 2, 1, 1; %e A140583 5, 1, 1, 1, 1; %e A140583 1, 4, 2, 1, 1, 1; %e A140583 7, 1, 1, 1, 1, 1, 1; %e A140583 2, 2, 2, 2, 1, 1, 1, 1; %e A140583 3, 3, 3, 1, 1, 1, 1, 1, 1; %e A140583 1, 6, 2, 2, 2, 1, 1, 1, 1, 1; %e A140583 ... %Y A140583 Cf. A014963, A140584, A140581. %K A140583 nonn,tabl %O A140583 1,2 %A A140583 _Gary W. Adamson_ and _Mats Granvik_, May 17 2008