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 A131032 #14 Oct 11 2021 18:43:38 %S A131032 1,3,1,5,2,1,7,2,2,1,9,2,2,2,1,11,2,2,2,2,1,13,2,2,2,2,2,1,15,2,2,2,2, %T A131032 2,2,1,17,2,2,2,2,2,2,2,1,19,2,2,2,2,2,2,2,2,1,21,2,2,2,2,2,2,2,2,2,1, %U A131032 23,2,2,2,2,2,2,2,2,2,2,1 %N A131032 A097806 * A130296. %C A131032 Row sums give A008574. %C A131032 A131033 = A130296 * A097806. %F A131032 A097806 * A130296 as infinite lower triangular matrices. A097806 = the pairwise operator, A130296 = (1; 2,1; 3,1,1; ...). %e A131032 First few rows of the triangle are: %e A131032 1; %e A131032 3, 1; %e A131032 5, 2, 1; %e A131032 7, 2, 2, 1; %e A131032 9, 2, 2, 2, 1; %e A131032 11, 2, 2, 2, 2, 1; %e A131032 13, 2, 2, 2, 2, 2, 1; %e A131032 ... %Y A131032 Cf. A008574, A097806, A130296, A131033. %K A131032 nonn,tabl %O A131032 1,2 %A A131032 _Gary W. Adamson_, Jun 10 2007 %E A131032 Definition corrected and more terms from _Georg Fischer_, Oct 10 2021