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 A130299 #4 Feb 20 2022 14:49:41 %S A130299 1,3,2,5,3,3,7,4,4,4,9,5,5,5,5,11,6,6,6,6,6,13,7,7,7,7,7,7,15,8,8,8,8, %T A130299 8,8,8,17,9,9,9,9,9,9,9,9,19,10,10,10,10,10,10,10,10,10 %N A130299 A130296 * A051340. %C A130299 Row sums = A018387: (1, 5, 11, 19, 29, 41, 55, ...). %C A130299 A130298 = A051340 * A130296. %F A130299 A130296 * A051340 as infinite lower triangular matrices. %e A130299 First few rows of the triangle: %e A130299 1; %e A130299 3, 2; %e A130299 5, 3, 3; %e A130299 7, 4, 4, 4; %e A130299 9, 5, 5, 5, 5; %e A130299 11, 6, 6, 6, 6, 6; %e A130299 13, 7, 7, 7, 7, 7, 7; %e A130299 ... %Y A130299 Cf. A051340, A130296, A130298, A028387. %K A130299 nonn,tabl %O A130299 1,2 %A A130299 _Gary W. Adamson_, May 20 2007