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 A245506 #5 Jul 25 2014 09:10:21
%S A245506 1,1,3,12,73,556,4737,44122,453441,5226984,69703201,1132247854,
%T A245506 22865062497,541274154604,13810143608913,361165919643666,
%U A245506 9534875308290433,254667431232941008,6928956222876625473,193066959857334885334,5521621116955849623201
%N A245506 Number of endofunctions f on [n] such that f^10(i) = f(i) for all i in [n].
%H A245506 Alois P. Heinz, <a href="/A245506/b245506.txt">Table of n, a(n) for n = 0..200</a>
%F A245506 E.g.f: exp(Sum_{j=0..2} (x*exp(x))^(3^j)/(3^j)).
%p A245506 egf:= exp(add((x*exp(x))^(3^j)/(3^j), j=0..2)):
%p A245506 a:= n-> n!*coeff(series(egf, x, n+1), x, n):
%p A245506 seq(a(n), n=0..25);
%Y A245506 Column k=10 of A245501.
%K A245506 nonn
%O A245506 0,3
%A A245506 _Alois P. Heinz_, Jul 24 2014