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 A227809 #5 Jul 31 2013 17:08:08 %S A227809 1,6,18,57,165,460,1242,3295,8589,22169,56675,143941,363527,914253, %T A227809 2291088,5725579,14275461,35526939,88279211,219088566,543169235, %U A227809 1345516437,3330785029,8240718421,20379364252,50380569630,124513186628,307663311638,760095010218 %N A227809 Number of rooted identity trees with n nodes and exactly 5 subtrees from the root. %H A227809 Alois P. Heinz, <a href="/A227809/b227809.txt">Table of n, a(n) for n = 15..800</a> %e A227809 : n=15 o : %e A227809 : / /|\ \ : %e A227809 : / ( | ) \ : %e A227809 : o o o o o : %e A227809 : /| | | | : %e A227809 : o o o o o : %e A227809 : | | | : %e A227809 : o o o : %e A227809 : | : %e A227809 : o : %Y A227809 Column k=5 of A227774. %K A227809 nonn %O A227809 15,2 %A A227809 _Alois P. Heinz_, Jul 31 2013