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 A239762 #9 Jul 18 2014 12:17:30 %S A239762 1,1,10,159,3568,106545,4062336,192754009 %N A239762 Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(f(g(x))) = g(f(x)). %Y A239762 Cf. A181162. %K A239762 nonn,more %O A239762 0,3 %A A239762 _Chad Brewbaker_, Mar 26 2014 %E A239762 a(6)-a(7) from _Giovanni Resta_, Mar 28 2014