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 A128980 #4 Feb 18 2022 22:27:11 %S A128980 1,0,1,1,0,1,0,0,0,1,3,0,0,0,1,0,1,0,0,0,1,5,0,0,0,0,0,1,0,0,0,0,0,0, %T A128980 0,1,0,0,1,0,0,0,0,0,1,0,3,0,0,0,0,0,0,0,1 %N A128980 A054525 * A129691(unsigned). %C A128980 Row sums = A070777: (1, 1, 2, 1, 4, 2, 6, 1, 2, 4, ...). A129691 = the unsigned inverse of A054523. %F A128980 Moebius transform of A129691 %e A128980 First few rows of the triangle: %e A128980 1; %e A128980 0, 1; %e A128980 1, 0, 1; %e A128980 0, 0, 0, 1; %e A128980 3, 0, 0, 0, 1; %e A128980 0, 1, 0, 0, 0, 1; %e A128980 5, 0, 0, 0, 0, 0, 1; %e A128980 0, 0, 0, 0, 0, 0, 0, 1; %e A128980 0, 0, 1, 0, 0, 0, 0, 0, 1; %e A128980 ... %Y A128980 Cf. A054525, A129691, A070777, A054523. %K A128980 nonn,tabl %O A128980 1,11 %A A128980 _Gary W. Adamson_, Apr 29 2007