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 A128544 #4 Feb 18 2022 22:21:28 %S A128544 1,2,1,3,4,2,4,9,9,3,5,16,24,17,5,6,25,50,55,33,8,7,36,90,135,123,61, %T A128544 13,8,49,147,280,343,259,112,21,9,64,224,518,798,812,532,202,34,10,81, %U A128544 324,882,1638,2100,1848,1062,361,55 %N A128544 A007318 * A128540. %C A128544 Row sums = A069403: (1, 3, 9, 25, 67, ...). %F A128544 A007318 * A128540 as infinite lower triangular matrices; (binomial transform of A128540). %e A128544 First few rows of the triangle: %e A128544 1; %e A128544 2, 1; %e A128544 3, 4, 2; %e A128544 4, 9, 9, 3; %e A128544 5, 16, 24, 17, 5; %e A128544 6, 25, 50, 55, 33, 8; %e A128544 7, 36, 90, 135, 123, 61, 13; %e A128544 ... %Y A128544 Cf. A007318, A128540, A069403. %K A128544 nonn,tabl %O A128544 0,2 %A A128544 _Gary W. Adamson_, Mar 10 2007