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 A128141 #4 Feb 15 2022 01:59:09 %S A128141 1,2,2,3,5,3,4,9,8,4,5,14,15,11,5,6,20,24,21,14,6,7,27,35,34,27,17,7, %T A128141 8,35,48,50,44,33,20,8,9,44,63,69,65,54,39,23,9,10,54,80,91,90,80,64, %U A128141 45,26,10 %N A128141 A122432 (unsigned) * A128132. %C A128141 Row sums = A006522 starting (1, 4, 11, 25, 50, 91, ...). A128142 = A128132 * A122432. %F A128141 Unsigned A122432 * A128132 as infinite lower triangular matrices; where unsigned A122432 = (1; 3, 1; 6, 3, 1; ...). %e A128141 First few rows of the triangle: %e A128141 1; %e A128141 2, 2; %e A128141 3, 5, 3; %e A128141 4, 9, 8, 4; %e A128141 5, 14, 15, 11, 5; %e A128141 6, 20, 24, 21, 14, 6; %e A128141 7, 27, 35, 34, 27, 17, 7; %e A128141 ... %Y A128141 Cf. A122432, A128132, A006522, A128142, A006325. %K A128141 nonn,tabl %O A128141 1,2 %A A128141 _Gary W. Adamson_, Feb 16 2007