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 A129560 #4 Feb 20 2022 01:21:30 %S A129560 1,1,1,3,0,1,3,2,0,1,7,0,1,0,1,5,4,1,1,0,1,13,0,1,0,1,0,1,9,6,1,2,0,1, %T A129560 0,1,19,0,3,0,1,0,1,0,1,13,10,1,2,1,1,0,1,0,1 %N A129560 A054523 * A128174. %C A129560 Row sums = A002620: (1, 2, 4, 6, 9, 12, 16, 20, ...). Left column = A106477: (1, 1, 3, 3, 7, 5, 13, 9, 19, ...). %F A129560 A054523 * A128174 as infinite lower triangular matrices. %e A129560 First few rows of the triangle: %e A129560 1; %e A129560 1, 1; %e A129560 3, 0, 1; %e A129560 3, 2, 0, 1; %e A129560 7, 0, 1, 0, 1; %e A129560 5, 4, 1, 1, 0, 1; %e A129560 13, 0, 1, 0, 1, 0, 1; %e A129560 ... %Y A129560 Cf. A054523, A128174, A106477, A002620. %K A129560 nonn,tabl %O A129560 1,4 %A A129560 _Gary W. Adamson_, Apr 20 2007