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 A031148 #7 Mar 30 2012 17:37:01 %S A031148 2,1,2,5,14,43,138,455,1540,5305,18546,65616,234546,845683,3072350, %T A031148 11235393,41326470,152793376,567518950,2116666670,7924062430, %U A031148 29765741831,112157686170,423809991041,1605622028100 %N A031148 Number of series-reduced planted trees with n leaves of 2 colors and no symmetries. %H A031148 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a> %H A031148 <a href="/index/Ro#rooted">Index entries for sequences related to rooted trees</a> %F A031148 Doubles (index 2+) under WEIGH transform. %Y A031148 Essentially the same as A052301. Cf. A000669, A001678, A038075, A050381. %K A031148 nonn,eigen %O A031148 1,1 %A A031148 _Christian G. Bower_