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 A339783 #8 Jan 10 2021 02:13:31 %S A339783 1,3,6,10,36,144,706,3774,22140,137096,888522,5950434,40936518, %T A339783 287748366,2059386024,14964163584,110160504906,820172543046, %U A339783 6167144620494,46780206203250,357620668556700,2753050958956812,21327412744225182,166164346278018822,1301341878493196986 %N A339783 Number of homeomorphically irreducible leaf colored trees with n leaves of 3 colors. %H A339783 Andrew Howroyd, <a href="/A339783/b339783.txt">Table of n, a(n) for n = 0..500</a> %o A339783 (PARI) U(25, 3) \\ See A339779 for U(n,k). %Y A339783 Column k=3 of A339779. %K A339783 nonn %O A339783 0,2 %A A339783 _Andrew Howroyd_, Dec 16 2020