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 A129565 #9 Feb 20 2022 01:22:25 %S A129565 1,0,1,1,1,1,0,0,1,1,1,1,1,1,1,0,0,0,1,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1, %T A129565 1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,1,1,1,1,1 %N A129565 A115359 * A000012 as infinite lower triangular matrices. %C A129565 Row sums = A026741: (1, 1, 3, 2, 5, 3, 7, 4, 9, 5, ...). %F A129565 A115359 * A000012 as infinite lower triangular matrices. Odd rows: n 1's; even rows, n/2 zeros followed by n/2 1's. %e A129565 First few rows of the triangle: %e A129565 1; %e A129565 0, 1; %e A129565 1, 1, 1; %e A129565 0, 0, 1, 1; %e A129565 1, 1, 1, 1, 1; %e A129565 0, 0, 0, 1, 1, 1; %e A129565 ... %Y A129565 Cf. A115359, A000012, A026741. %K A129565 nonn,tabl %O A129565 1,1 %A A129565 _Gary W. Adamson_, Apr 21 2007 %E A129565 Name corrected by _Gary W. Adamson_, Mar 14 2011