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 A134199 #5 Mar 25 2022 00:36:30 %S A134199 1,3,2,1,6,3,1,2,9,4,1,2,3,12,5,1,2,3,4,15,6,1,2,3,4,5,18,7,1,2,3,4,5, %T A134199 6,21,8,1,2,3,4,5,6,7,24,9,1,2,3,4,5,6,7,8,27,10 %N A134199 A002260 + A134082 - I as infinite lower triangular matrices; I = Identity matrix. %C A134199 Row sums = A052905: (1, 5, 10, 16, 23, 31, 40, ...). %e A134199 First few rows of the triangle: %e A134199 1; %e A134199 3, 2; %e A134199 1, 6, 3; %e A134199 1, 2, 9, 4; %e A134199 1, 2, 3, 12, 5; %e A134199 1, 2, 3, 4, 15, 6; %e A134199 1, 2, 3, 4, 5, 18, 7; %e A134199 ... %Y A134199 Cf. A002260, A134082, A052905. %K A134199 nonn,tabl %O A134199 0,2 %A A134199 _Gary W. Adamson_, Oct 13 2007