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 A091241 #8 Mar 31 2012 14:02:20 %S A091241 1,1,2,6,43,311,3039,40323 %N A091241 Size of range [Smallest GF2X-Matula number coding a tree of n nodes, Largest GF2X-Matula number coding a tree of n nodes]. %H A091241 A. Karttunen, <a href="/A091247/a091247.scm.txt">Scheme-program for computing this sequence.</a> %F A091241 a(n) = (A091240(n)-A091239(n))+1. %Y A091241 Compare to A091233 and A000081. %K A091241 nonn %O A091241 1,3 %A A091241 _Antti Karttunen_, Jan 03 2004