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 A134480 #8 Mar 26 2022 10:15:12 %S A134480 1,3,2,9,7,4,18,15,11,6,30,26,21,15,8,45,40,34,27,19,10,63,57,50,42, %T A134480 33,23,12,84,77,69,60,50,39,27,14,108,100,91,81,70,58,45,31,16,135, %U A134480 126,116,105,93,80,66,51,35,18 %N A134480 A134478 * A000012. %C A134480 Row sums = A134481: (1, 5, 20, 50, 100, 175, ...). %C A134480 Left border = A134479. %F A134480 A134478 * A000012 as infinite lower triangular matrices. Triangle read by rows, partial sums of A134478 terms starting from the right. %e A134480 First few rows of the triangle: %e A134480 1; %e A134480 3, 2; %e A134480 9, 7, 4; %e A134480 18, 15, 11, 6; %e A134480 30, 26, 21, 15, 8; %e A134480 45, 40, 34, 27, 19, 10; %e A134480 63, 57, 50, 42, 33, 23, 12; %e A134480 ... %Y A134480 Cf. A134478, A134481, A134479. %K A134480 nonn,tabl,more %O A134480 0,2 %A A134480 _Gary W. Adamson_, Oct 27 2007