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 A131031 #14 May 29 2023 11:30:35 %S A131031 1,3,1,6,3,1,12,6,3,1,24,12,6,3,1,48,24,12,6,3,1,96,48,24,12,6,3,1,96, %T A131031 48,24,12,6,3,1 %N A131031 Erroneous duplicate of A130452. %C A131031 a(28) = 192 should have been inserted. - _Georg Fischer_, May 29 2023 %e A131031 First few rows of the triangle: %e A131031 1; %e A131031 3, 1; %e A131031 6, 3, 1; %e A131031 12, 6, 3, 1; %e A131031 24, 12, 6, 3, 1; %e A131031 48, 24, 12, 6, 3, 1; %e A131031 ... %K A131031 dead %O A131031 0,2 %A A131031 _Gary W. Adamson_, Jun 09 2007