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 A239784 #9 Jul 18 2014 12:29:51 %S A239784 1,1,14,351,14776,902605,75313056,8194699387 %N A239784 Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(g(g(x))) = f(g(f(x))). %Y A239784 Cf. A181162. %K A239784 nonn,more %O A239784 0,3 %A A239784 _Chad Brewbaker_, Mar 26 2014 %E A239784 a(6)-a(7) from _Giovanni Resta_, Mar 28 2014