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 A131832 #6 Mar 04 2022 01:27:20 %S A131832 1,3,3,5,3,5,7,5,5,7,9,7,11,7,9,11,9,19,19,9,11,13,11,29,39,29,11,13, %T A131832 15,13,41,69,69,41,13,15,17,15,55,111,139,111,55,15,17,19,17,71,167, %U A131832 251,251,167,71,17,19 %N A131832 2*(A131830) - A000012. %C A131832 Row sums = A131833: (1, 6, 13, 24, 43, 78, ...). %F A131832 2*(A131810) - A000012 as infinite lower triangular matrices. %e A131832 First few rows of the triangle: %e A131832 1; %e A131832 3, 3; %e A131832 5, 3, 5; %e A131832 7, 5, 5, 7; %e A131832 9, 7, 11, 7, 9; %e A131832 11, 9, 19, 19, 9, 11; %e A131832 13, 11, 29, 39, 29, 11, 13; %e A131832 15, 13, 41, 69, 69, 41, 13, 15; %e A131832 ... %Y A131832 Cf. A131830, A131833. %K A131832 nonn,tabl %O A131832 0,2 %A A131832 _Gary W. Adamson_, Jul 20 2007