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 A129555 #4 Feb 18 2022 22:46:23 %S A129555 1,1,1,3,0,1,2,1,0,1,5,0,0,0,1,3,3,1,0,0,1,7,0,0,0,0,0,1,4,2,0,1,0,0, %T A129555 0,1,9,0,3,0,0,0,0,0,1,5,5,0,0,1,0,0,0,0,1 %N A129555 A054523 * A129372. %C A129555 Row sums = A002131: (1, 2, 4, 4, 6, 8, 8, 8, 13, 12, ...). Left column = A016741: (1, 1, 3, 2, 5, 3, 7, ...). %F A129555 A054523 * A129372 as infinite lower triangular matrices. %e A129555 First few rows of the triangle: %e A129555 1; %e A129555 1, 1; %e A129555 3, 0, 1; %e A129555 2, 1, 0, 1; %e A129555 5, 0, 0, 0, 1; %e A129555 3, 3, 1, 0, 0, 1; %e A129555 7, 0, 0, 0, 0, 0, 1; %e A129555 4, 2, 0, 1, 0, 0, 0, 1; %e A129555 9, 0, 3, 0, 0, 0, 0, 0, 1; %e A129555 ... %Y A129555 Cf. A054523, A129372, A002131, A026741. %K A129555 nonn,tabl %O A129555 0,4 %A A129555 _Gary W. Adamson_, Apr 20 2007