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 A039808 #10 Jul 23 2021 02:42:40
%S A039808 1,1,2,4,9,20,47,109,258,609,1447,3434,8175,19449,46327,110330,262882,
%T A039808 626317,1492515,3556540,8475679,20198343,48136276,114716767,273393363,
%U A039808 651550405,1552783297,3700609736,8819356189
%N A039808 Shifts left under transform T where Ta is product of Partition Triangle A008284 with a.
%F A039808 G.f.: x + x * Sum_{n>=1} a(n) * x^n / Product_{j=1..n} (1 - x^j). - _Ilya Gutkovskiy_, Jul 22 2021
%Y A039808 Cf. A008284, A039809.
%K A039808 nonn,eigen
%O A039808 1,3
%A A039808 _Christian G. Bower_, Feb 15 1999