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 A055345 #7 Mar 30 2012 17:37:11 %S A055345 1,7,56,318,1408,5207,16772,48410,127661,312172,715827,1552945, %T A055345 3210066,6359208,12131129,22374522,40034564,69695820,118346132, %U A055345 196435550,319321325,509215461,797775355,1229513719,1866237409 %N A055345 Number of mobiles (circular rooted trees) with n nodes and 7 leaves. %H A055345 <a href="/index/Mo#mobiles">Index entries for sequences related to mobiles</a> %Y A055345 Column 7 of A055340. %K A055345 nonn %O A055345 8,2 %A A055345 _Christian G. Bower_, May 14 2000