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 A133571 #5 Mar 23 2022 01:04:54 %S A133571 1,3,1,3,2,1,5,5,5,1,5,4,10,4,1,7,9,26,14,7,1,7,6,35,20,21,6,1,9,13, %T A133571 71,55,71,27,9,1,9,8,84,56,126,56,36,8,1,11,17,148,140,322,182,14844, %U A133571 11,1 %N A133571 (A007318 * A133080 + A133080 * A007318) - A007318. %C A133571 Row sums = A133572: (1, 4, 6, 16, 24, 64, 96, 256, ...). %F A133571 (A007318 * A133080 + A133080 * A007318) - A007318, as infinite lower triangular matrices, where A133080 is an interpolation operator. %e A133571 First few rows of the triangle: %e A133571 1; %e A133571 3, 1; %e A133571 3, 2, 1; %e A133571 5, 5, 5, 1; %e A133571 5, 4, 10, 4, 1; %e A133571 7, 9, 26, 14, 7, 1; %e A133571 7, 6, 35, 20, 21, 6, 1; %e A133571 9, 13, 71, 55, 71, 27, 9, 1; %e A133571 ... %Y A133571 Cf. A133080, A133572. %K A133571 nonn,tabl %O A133571 1,2 %A A133571 _Gary W. Adamson_, Sep 16 2007