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 A038080 #18 Dec 26 2020 17:56:55 %S A038080 1,3,3,9,39,189,981,5490,31674,189954,1170126,7382745,47494197, %T A038080 310712808,2061987642,13855192866,94113385437,645424668666, %U A038080 4464027720900,31110200069511,218292811705458,1541172223659249 %N A038080 Number of identity trees with 3-colored nodes. %H A038080 Vaclav Kotesovec, <a href="/A038080/b038080.txt">Table of n, a(n) for n = 0..1000</a> %H A038080 <a href="/index/Tra#trees">Index entries for sequences related to trees</a> %F A038080 G.f.: B(x) - B^2(x)/2 - B(x^2)/2, where B(x) is g.f. for A038079. %F A038080 a(n) ~ c * d^n / n^(5/2), where d = 7.969494030514425004826375511986491746399264355846412073489715938... and c = 0.3712461766927875417276388215355520756010680416348018056669... - _Vaclav Kotesovec_, Dec 26 2020 %Y A038080 Cf. A000220, A038077-A038079, A052757, A255517. %K A038080 nonn %O A038080 0,2 %A A038080 _Christian G. Bower_, Jan 04 1999