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 A128807 #4 Feb 18 2022 22:26:34 %S A128807 1,2,1,1,2,1,3,4,3,1,1,4,6,4,1,2,7,11,10,5,1,1,6,15,20,15,6,1,4,11,24, %T A128807 36,35,21,7,1,1,8,28,56,70,56,28,8,1,2,13,42,88,127,126,84,36,9,1 %N A128807 A115361 * A007318. %C A128807 Row sums = A127804: (1, 3, 4, 11, 16, 36, 64, ...). Left column = the Ruler sequence, A001511: (1, 2, 1, 3, 1, 2, 1, 4, ...). A129262 = A007318 * A115361. %F A128807 A115361 * A007318 as infinite lower triangular matrices. %e A128807 First few rows of the triangle: %e A128807 1; %e A128807 2, 1; %e A128807 1, 2, 1; %e A128807 3, 4, 3, 1; %e A128807 1, 4, 6, 4, 1; %e A128807 2, 7, 11, 10, 5, 1; %e A128807 1, 6, 15, 20, 15, 6, 1; %e A128807 4, 11, 24, 36, 35, 21, 7, 1; %e A128807 ... %Y A128807 Cf. A115361, A007318, A129262, A001511, A127804. %K A128807 nonn,tabl %O A128807 0,2 %A A128807 _Gary W. Adamson_, Apr 06 2007