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 A134545 #8 Mar 26 2022 10:21:27 %S A134545 1,3,1,4,2,1,7,4,2,1,6,4,3,2,1,12,8,5,3,2,1,8,6,5,4,3,2,1,15,11,8,6,4, %T A134545 3,2,1,13,10,8,6,5,4,3,2,1,18,14,11,9,7,5,4,3,2,1 %N A134545 A051731 * A004736. %C A134545 Row sums = A007437: (1, 4, 7, 14, 16, 31, ...). %C A134545 Left border = sigma(n), A000203: (1, 3, 4, 7, 6, 12, ...). %F A134545 A051731 * A004736 as infinite lower triangular matrices. %e A134545 First few rows of the triangle: %e A134545 1; %e A134545 3, 1; %e A134545 4, 2, 1; %e A134545 7, 4, 2, 1; %e A134545 6, 4, 3, 2, 1; %e A134545 12, 8, 5, 3, 2, 1; %e A134545 8, 6, 5, 4, 3, 2, 1; %e A134545 15, 11, 8, 6, 4, 3, 2, 1; %e A134545 ... %Y A134545 Cf. A051731, A004736, A007436, A000203. %K A134545 nonn,tabl,more %O A134545 1,2 %A A134545 _Gary W. Adamson_, Oct 31 2007