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 A245143 #4 Jul 12 2014 17:36:00 %S A245143 1,0,0,1,1,1,3,3,5,9,12,17,32,42,64,106,157,232,379,563,866,1362,2081, %T A245143 3186,5028,7710,11924,18659,28938,44842,70254,109245,170266,266562, %U A245143 416378,650513,1020431,1597803,2504070,3932672,6174777,9698203,15258753,24005178 %N A245143 Number of n-node unlabeled rooted trees with thickening limbs and root outdegree (branching factor) 3. %H A245143 Alois P. Heinz, <a href="/A245143/b245143.txt">Table of n, a(n) for n = 4..150</a> %Y A245143 Column k=3 of A245151. %K A245143 nonn %O A245143 4,7 %A A245143 _Alois P. Heinz_, Jul 12 2014