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 A128181 #6 Feb 15 2022 01:51:58 %S A128181 1,1,2,2,4,3,4,8,9,4,8,16,21,16,5,16,32,45,44,25,6,32,64,93,104,80,36, %T A128181 7,64,128,189,228,210,132,49,8,128,256,381,480,495,384,203,64,9,256, %U A128181 512,765,988,1095,978,651,296,81,10 %N A128181 A007318 * A128179 as infinite lower triangular matrices. %C A128181 Binomial transform of A128179. %C A128181 Row sums = A058396 starting (1, 3, 9, 25, 66, 168, ...). %e A128181 First few rows of the triangle: %e A128181 1; %e A128181 1, 2; %e A128181 2, 4, 3; %e A128181 4, 8, 9, 4; %e A128181 8, 16, 21, 16, 5; %e A128181 16, 32, 45, 44, 25, 6; %e A128181 32, 64, 93, 104, 80, 36, 7; %e A128181 ... %Y A128181 Cf. A128179, A097807, A002260, A058396. %K A128181 nonn,tabl %O A128181 1,3 %A A128181 _Gary W. Adamson_, Feb 17 2007