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 A132048 #4 Mar 05 2022 01:00:25 %S A132048 1,1,1,1,5,1,1,8,8,1,1,11,17,11,1,1,14,29,29,14,1,1,17,44,59,44,17,1, %T A132048 1,20,62,104,104,62,20,1,1,23,83,167,209,167,83,23,1,1,26,107,251,377, %U A132048 377,251,107,26,1 %N A132048 3*A007318 - A103451 - A000012. %C A132048 Row sums = A077802: (1, 2, 7, 18, 41, 88, ...). %F A132048 3*A007318 - A103451 - A000012 as infinite lower triangular matrices. %e A132048 First few rows of the triangle: %e A132048 1; %e A132048 1, 1; %e A132048 1, 5, 1; %e A132048 1, 8, 8, 1; %e A132048 1, 11, 17, 11, 1; %e A132048 1, 14, 29, 29, 14, 1; %e A132048 1, 17, 44, 59, 44, 17, 1; %e A132048 ... %Y A132048 Cf. A007318, A103451, A000012, A077802. %K A132048 nonn,tabl %O A132048 0,5 %A A132048 _Gary W. Adamson_, Aug 08 2007