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 A127737 #5 Feb 14 2022 23:36:42 %S A127737 1,3,4,3,7,9,3,7,13,16,3,7,13,21,25,3,7,13,21,31,36,3,7,13,21,31,43, %T A127737 49,3,7,13,21,31,43,57,64,3,7,13,21,31,43,57,73,81,3,7,13,21,31,43,57, %U A127737 73,91,100 %N A127737 A002260 * A127701. %C A127737 Deleting the right border (1, 4, 9, 16, ...), rows tend to A002061 starting (3, 7, 13, 21, 31, ...). Row sums = A108766: (1, 7, 19, 39, 69, 111, ...). %F A127737 A002260 * A127701 as infinite lower triangular matrices. %e A127737 First few rows of the triangle: %e A127737 1; %e A127737 3, 4; %e A127737 3, 7, 9; %e A127737 3, 7, 13, 16; %e A127737 3, 7, 13, 21, 25; %e A127737 ... %Y A127737 Cf. A002260, A127701, A108766, A002061. %K A127737 nonn,tabl %O A127737 1,2 %A A127737 _Gary W. Adamson_, Jan 27 2007