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 A200248 #14 Mar 30 2012 17:23:11
%S A200248 0,1,2,9,68,710,9414,151032,2840648,61247664,1488691530,40262372480,
%T A200248 1199047315212,38984874829056,1373954963380622,52171222364513280,
%U A200248 2123286652815757200,92201888436661409792,4255016114128163220882,207954945060162884960256
%N A200248 The number of (simultaneously) fixed and isolated points in the digraph representation of all functions f:{1,2,...,n}->{1,2,...,n}.
%C A200248 A fixed point is a vertex with a self loop. An isolated point is a vertex that is not joined to any other vertex.
%H A200248 T. D. Noe, <a href="/A200248/b200248.txt">Table of n, a(n) for n = 0..101</a>
%F A200248 a(n)= n*A001865
%F A200248 E.g.f.: x*C(x) where C(x) is the e.g.f. for A001865
%t A200248 t=Sum[n^(n-1)x^n/n!,{n,1,20}];Range[0,20]! CoefficientList[Series[x(Log[1/(1-t)]+1),{x,0,20}],x]
%K A200248 nonn
%O A200248 0,3
%A A200248 _Geoffrey Critzer_, Nov 16 2011