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 A131922 #10 Jun 08 2023 04:55:56 %S A131922 1,2,3,3,5,5,4,7,7,7,5,9,9,9,9,6,11,11,11,11,11,7,13,13,13,13,13,13,8, %T A131922 15,15,15,15,15,15,15,9,17,17,17,17,17,17,17,17,10,19,19,19,19,19,19, %U A131922 19,19,19,11,21,21,21,21,21,21,21,21,21,21,12,23,23,23,23,23,23,23,23,23,23,23 %N A131922 Triangle read by rows: 2*A002024 - A130296 as infinite lower triangular matrices. %C A131922 Row sums = A001844: (1, 5, 13, 25, 41, 61, 85, ...). %e A131922 First few rows of the triangle: %e A131922 1; %e A131922 2, 3; %e A131922 3, 5, 5; %e A131922 4, 7, 7, 7; %e A131922 5, 9, 9, 9, 9; %e A131922 ... %Y A131922 Cf. A001844, A002024, A130296. %K A131922 nonn,tabl %O A131922 0,2 %A A131922 _Gary W. Adamson_, Jul 29 2007 %E A131922 Edited and more terms from _Georg Fischer_, Jun 08 2023