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 A239783 #9 Jul 18 2014 12:30:27 %S A239783 1,1,14,339,12496,639005,42829536,3624387739 %N A239783 Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(g(x)) = f(g(f(x))). %Y A239783 Cf. A181162. %K A239783 nonn,more %O A239783 0,3 %A A239783 _Chad Brewbaker_, Mar 26 2014 %E A239783 a(6)-a(7) from _Giovanni Resta_, Mar 28 2014