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 A055344 #7 Mar 30 2012 17:37:11 %S A055344 1,6,40,184,688,2178,6116,15493,36203,78954,162537,318261,596881, %T A055344 1077561,1881218,3187222,5257026,8463247,13329249,20576809,31189362, %U A055344 46486870,68222601,98696480,140898502,198674609,276933307,381882149 %N A055344 Number of mobiles (circular rooted trees) with n nodes and 6 leaves. %H A055344 <a href="/index/Mo#mobiles">Index entries for sequences related to mobiles</a> %Y A055344 Column 6 of A055340. %K A055344 nonn %O A055344 7,2 %A A055344 _Christian G. Bower_, May 14 2000