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 A133113 #8 Mar 20 2022 22:55:51 %S A133113 1,2,1,4,2,1,6,4,4,1,9,6,11,4,1,12,9,24,11,6,1,16,12,46,24,22,6,1,20, %T A133113 16,80,46,62,22,8,1,25,20,130,80,148,62,37,8,1,30,25,200,130,314,148, %U A133113 128,37,10,1 %N A133113 A128174 * A007318 * A133080. %C A133113 Row sums = 2^n - 1, A000225: (1, 3, 7, 15, 31, ...). %F A133113 A128174 * A007318 * A133080 as infinite lower triangular matrices. %e A133113 First few rows of the triangle: %e A133113 1; %e A133113 2, 1; %e A133113 4, 2, 1; %e A133113 6, 4, 4, 1; %e A133113 9, 6, 11, 4, 1; %e A133113 12, 9, 24, 11, 6, 1; %e A133113 16, 12, 46, 24, 22, 6, 1; %e A133113 20, 16, 80, 46, 62, 22, 8, 1; %e A133113 ... %Y A133113 Cf. A133080, A007318, A128174, A000225. %K A133113 nonn,tabl %O A133113 1,2 %A A133113 _Gary W. Adamson_, Sep 14 2007