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 A130313 #4 Feb 20 2022 14:53:19 %S A130313 1,2,1,4,1,1,6,2,1,1,10,2,1,1,1,12,4,2,1,1,1,18,4,2,1,1,1,1,22,6,2,2, %T A130313 1,1,1,1,28,6,4,2,1,1,1,1,1,32,10,4,2,2,1,1,1,1,1 %N A130313 A000012 * A054523. %C A130313 Row sums = the triangular series, A000217: (1, 3, 6, 10, ...). %C A130313 Left column = A002088: (1, 2, 4, 6, 10, 12, 18, ...). %F A130313 A000012 * A054523 as infinite lower triangular matrices. %e A130313 First few rows of the triangle: %e A130313 1; %e A130313 2, 1; %e A130313 4, 1, 1; %e A130313 6, 2, 1, 1; %e A130313 10, 2, 1, 1, 1; %e A130313 12, 4, 2, 1, 1, 1; %e A130313 18, 4, 2, 1, 1, 1, 1; %e A130313 ... %Y A130313 Cf. A000012, A054523, A000217. %K A130313 nonn,tabl %O A130313 1,2 %A A130313 _Gary W. Adamson_, May 21 2007