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 A131034 #4 Feb 21 2022 00:20:06 %S A131034 1,2,1,4,1,1,6,2,1,1,8,2,2,1,1,10,2,2,2,1,12,2,2,2,2,1,1,14,2,2,2,2,2, %T A131034 1,1,16,2,2,2,2,2,2,1,1 %N A131034 A129686 * A051340. %C A131034 Row sums = A113127: (1, 3, 6, 10, 14, 18, 22, ...). %F A131034 A129686 * A051340 as infinite lower triangular matrices. %e A131034 First few rows of the triangle: %e A131034 1; %e A131034 2, 1; %e A131034 4, 1, 1; %e A131034 6, 2, 1, 1; %e A131034 8, 2, 2, 1, 1; %e A131034 10, 2, 2, 2, 1, 1; %e A131034 ... %Y A131034 Cf. A129686, A051340, A113127. %K A131034 nonn,tabl %O A131034 0,2 %A A131034 _Gary W. Adamson_, Jun 10 2007