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 A245505 #5 Jul 25 2014 09:18:26
%S A245505 1,1,4,19,116,901,8422,89755,1066088,14154409,212952266,3646226959,
%T A245505 69912304156,1460516349709,32480282189006,759186766079011,
%U A245505 18569220500830928,475114325555073745,12719547174925542034,356098625214192355735,10413932958067814029316
%N A245505 Number of endofunctions f on [n] such that f^9(i) = f(i) for all i in [n].
%H A245505 Alois P. Heinz, <a href="/A245505/b245505.txt">Table of n, a(n) for n = 0..200</a>
%F A245505 E.g.f.: exp(Sum_{j=0..3} (x*exp(x))^(2^j)/(2^j)).
%p A245505 egf:= exp(add((x*exp(x))^(2^j)/(2^j), j=0..3)):
%p A245505 a:= n-> n!*coeff(series(egf, x, n+1), x, n):
%p A245505 seq(a(n), n=0..25);
%Y A245505 Column k=9 of A245501.
%K A245505 nonn
%O A245505 0,3
%A A245505 _Alois P. Heinz_, Jul 24 2014