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 A129572 #4 Feb 20 2022 01:24:23 %S A129572 1,1,1,1,1,1,0,0,1,1,1,0,0,1,1,1,1,0,0,1,1,1,0,0,0,0,1,1,0,0,0,0,0,0, %T A129572 1,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,0,1,1 %N A129572 A129372 * A097806. %C A129572 Row sums = A086374: (1, 2, 3, 2, 3, 4, 3, 2, 5, 4, ...). A129573 = A097806 * A129372. %F A129572 A129372 * A097806 as infinite lower triangular matrices. %e A129572 First few rows of the triangle: %e A129572 1; %e A129572 1, 1; %e A129572 1, 1, 1; %e A129572 0, 0, 1, 1; %e A129572 1, 0, 0, 1, 1; %e A129572 1, 1, 0, 0, 1, 1; %e A129572 1, 0, 0, 0, 0, 1, 1; %e A129572 0, 0, 0, 0, 0, 0, 1, 1; %e A129572 ... %Y A129572 Cf. A129372, A097806, A086374, A129573. %K A129572 nonn,tabl %O A129572 1,1 %A A129572 _Gary W. Adamson_, Apr 22 2007