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 A133545 #5 Mar 23 2022 01:06:45 %S A133545 1,3,1,6,5,1,11,12,7,1,20,24,20,9,1,37,45,45,30,11,1,70,83,91,76,42, %T A133545 13,1,135,154,175,168,119,56,15,1,264,290,330,344,288,176,72,17,1,521, %U A133545 555,621,675,633,465,249,90,19,1 %N A133545 (A000012 * A007318 - A007318 * A000012) - A000012. %C A133545 Row sums = A133546: (1, 4, 12, 31, 74, 169, ...). %C A133545 Left border = A006127: (1, 3, 6, 11, 20, ...). %F A133545 (A000012 * A007318 - A007318 * A000012) - A000012 as infinite lower triangular matrices. %e A133545 First few rows of the triangle: %e A133545 1; %e A133545 3, 1; %e A133545 6, 5, 1; %e A133545 11, 12, 7, 1; %e A133545 20, 24, 20, 9, 1; %e A133545 37, 45, 45, 30, 11, 1; %e A133545 70, 83, 91, 76, 42, 13, 1; %e A133545 ... %Y A133545 Cf. A000012, A007318, A133546, A006127. %K A133545 nonn,tabl %O A133545 1,2 %A A133545 _Gary W. Adamson_, Sep 15 2007