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 A128116 #7 Feb 15 2022 07:34:14 %S A128116 1,5,2,12,7,3,22,15,9,4,35,26,18,11,5,51,40,30,21,13,6,70,57,45,34,24, %T A128116 15,7,92,77,63,50,38,27,17,8,117,100,84,69,55,42,30,19,9,145,126,108, %U A128116 91,75,60,46,33,21,10 %N A128116 A128064 * A122432 (unsigned). %C A128116 Left border of the triangle = A000326, the pentagonal numbers: (1, 5, 12, 22, 35, ...). %C A128116 Row sums = A002412: (1, 7, 22, 50, 95, ...). %F A128116 A128064 * A122432 (unsigned), where the unsigned version of A122432 = (1; 3, 1; 6, 3, 1; 10, 6, 3, 1; ...). %e A128116 First few rows of the triangle: %e A128116 1; %e A128116 5, 2; %e A128116 12, 7, 3; %e A128116 22, 15, 9, 4; %e A128116 35, 26, 18, 11, 5; %e A128116 51, 40, 30, 21, 13, 6; %e A128116 70, 57, 45, 34, 24, 15, 7; %e A128116 ... %Y A128116 Cf. A128064, A122432, A000326, A002412. %K A128116 nonn,tabl %O A128116 1,2 %A A128116 _Gary W. Adamson_, Feb 14 2007