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 A245144 #4 Jul 12 2014 17:48:07 %S A245144 1,0,0,0,1,1,1,1,3,3,5,5,11,12,19,24,41,51,78,101,163,215,320,431,661, %T A245144 908,1333,1846,2745,3847,5630,7913,11620,16481,23991,34134,49782, %U A245144 71196,103416,148178,215511,309881,449941,647868,941279,1358857,1973315,2851880 %N A245144 Number of n-node unlabeled rooted trees with thickening limbs and root outdegree (branching factor) 4. %H A245144 Alois P. Heinz, <a href="/A245144/b245144.txt">Table of n, a(n) for n = 5..150</a> %Y A245144 Column k=4 of A245151. %K A245144 nonn %O A245144 5,9 %A A245144 _Alois P. Heinz_, Jul 12 2014