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 A091934 #14 Nov 30 2014 10:44:50 %S A091934 1,3,4,7,8,10,11,15,19,24,25,30 %N A091934 Number of dual isomorphisms on [ n,n* ]. %C A091934 I would like a better definition. - _N. J. A. Sloane_. %H A091934 Jon Perry, <a href="http://web.archive.org/web/20040725031055/http://www.users.globalnet.co.uk/~perry/maths/recentstuff/recentstuff.htm">Trees of height 2 (bottom of page)</a> [wayback cached version] %Y A091934 Cf. A220096. %K A091934 nonn,more,uned,obsc %O A091934 1,2 %A A091934 _Jon Perry_, Mar 11 2004