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 A053572 #3 Mar 31 2012 10:32:48 %S A053572 1,1,1,3,16,75,384,1805,8640,42336,207368,995808,5184000,24192672, %T A053572 121730700,594350400,2921811200 %N A053572 Maximal number of spanning trees in a planar graph with n nodes. %K A053572 nonn,nice,hard %O A053572 0,4 %A A053572 _Brendan McKay_, Jan 18 2000