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 A128260 #5 Feb 18 2022 22:10:20 %S A128260 1,2,1,3,2,1,4,1,3,1,5,4,0,4,1,6,1,1,0,5,1,7,6,6,0,0,6,1,8,1,0,1,0,0, %T A128260 7,1,9,8,1,8,0,0,0,8,1,10,1,9,0,1,0,0,0,9,1 %N A128260 A128229 * A051731. %C A128260 Row sums = A128261: (1, 3, 6, 9, 14, 14, 26, 18, 35, 31, ...). %e A128260 First few rows of the triangle: %e A128260 1; %e A128260 2, 1; %e A128260 3, 2, 1; %e A128260 4, 1, 3, 1; %e A128260 5, 4, 0, 4, 1; %e A128260 6, 1, 1, 0, 5, 1; %e A128260 7, 6, 6, 0, 0, 6, 1; %e A128260 8, 1, 0, 1, 0, 0, 7, 1; %e A128260 ... %Y A128260 Cf. A128229, A051731, A128261, A128259. %K A128260 nonn,tabl %O A128260 1,2 %A A128260 _Gary W. Adamson_, Feb 21 2007