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 A129569 #4 Feb 20 2022 01:23:10 %S A129569 1,0,1,0,0,1,0,1,0,1,0,0,1,0,1,0,0,0,1,0,1,0,0,1,0,1,0,1,0,1,0,1,0,1, %T A129569 0,1,0,0,0,0,1,0,1,0,1,0,0,0,1,0,1,0,1,0,1 %N A129569 A129360 * A128174. %C A129569 Row sums = A055034: (1, 1, 1, 2, 2, 2, 3, 4, 3, 4, ...). %F A129569 A129360 * A128174 as infinite lower triangular matrices. %e A129569 First few rows of the triangle: %e A129569 1; %e A129569 0, 1; %e A129569 0, 0, 1; %e A129569 0, 1, 0, 1; %e A129569 0, 0, 1, 0, 1; %e A129569 0, 0, 0, 1, 0, 1; %e A129569 0, 0, 1, 0, 1, 0, 1; %e A129569 ... %Y A129569 Cf. A129360, A128174, A055034. %K A129569 nonn,tabl %O A129569 1,1 %A A129569 _Gary W. Adamson_, Apr 22 2007