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 A133699 #5 Mar 23 2022 01:06:56 %S A133699 1,1,1,1,0,2,1,1,0,1,1,0,0,0,2,1,1,2,0,0,2,1,0,0,0,0,0,2,1,1,0,1,0,0, %T A133699 0,1,1,0,2,0,0,0,0,0,3,1,1,0,0,2,0,0,0,0,2 %N A133699 A051731 * A133698. %C A133699 Right border = A001227, the number of odd divisors of n. %C A133699 Row sums = A133700: (1, 2, 3, 3, 3, 6, 3, 4, 6, 6, ...) %F A133699 Inverse Mobius transform of A133698, as infinite lower triangular matrices. %e A133699 First few rows of the triangle: %e A133699 1; %e A133699 1, 1; %e A133699 1, 0, 2; %e A133699 1, 1, 0, 1; %e A133699 1, 0, 0, 0, 2; %e A133699 1, 1, 2, 0, 0, 2; %e A133699 1, 0, 0, 0, 0, 0, 2; %e A133699 1, 1, 0, 1, 0, 0, 0, 1; %e A133699 ... %Y A133699 Cf. A051731, A133698, A133700. %K A133699 nonn,tabl %O A133699 1,6 %A A133699 _Gary W. Adamson_, Sep 21 2007