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 A132119 #4 Mar 05 2022 00:56:20 %S A132119 1,3,3,6,5,6,10,8,9,10,15,12,13,14,15,21,17,18,19,20,21,28,23,24,25, %T A132119 26,27,28,36,30,31,32,33,34,35,36,45,38,39,40,41,42,43,44,45,55,47,48, %U A132119 49,50,51,52,53,54,55 %N A132119 A002260 + A000027 - A000012 as infinite lower triangular matrices. %C A132119 Row sums = A132127: (1, 6, 17, 37, 69, 116, ...). %e A132119 First few rows of the triangle: %e A132119 1; %e A132119 3, 3; %e A132119 6, 5, 6; %e A132119 10, 8, 9, 10; %e A132119 15, 12, 13, 14, 15; %e A132119 21, 17, 18, 19, 20, 21; %e A132119 ... %Y A132119 Cf. A002260, A000027, A000012, A132127. %K A132119 nonn,tabl %O A132119 1,2 %A A132119 _Gary W. Adamson_, Aug 10 2007