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 A129571 #4 Feb 20 2022 01:24:08 %S A129571 1,1,1,0,2,1,1,3,3,1,0,4,6,4,1,0,4,10,10,5,1,0,6,15,20,15,6,1,1,7,21, %T A129571 35,35,21,7,1,0,6,27,56,70,56,28,8,1,0,8,36,84,126,126,84,36,9,1 %N A129571 A129360 * A007318. %C A129571 First 10 row sums match A128022: (1, 2, 3, 8, 15, 30, 63, 128, 252, 510, ...). A129570 = A007318 * A129360. %F A129571 A129360 * A007318 as infinite lower triangular matrices. %e A129571 First few rows of the triangle: %e A129571 1; %e A129571 1, 1; %e A129571 0, 2, 1; %e A129571 1, 3, 3, 1; %e A129571 0, 4, 6, 4, 1; %e A129571 0, 4, 10, 10, 5, 1; %e A129571 0, 6, 15, 20, 15, 6, 1; %e A129571 1, 7, 21, 35, 35, 21, 7, 1; %e A129571 ... %Y A129571 Cf. A007318, A129360, A128022, A129570. %K A129571 nonn,tabl %O A129571 1,5 %A A129571 _Gary W. Adamson_, Apr 22 2007