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 A239758 #9 Jul 18 2014 12:36:23 %S A239758 1,1,8,147,4672,221245,14695656,1297497103 %N A239758 Number of pairs of functions (f,g) on a set of n elements into itself satisfying f(g(f(x))) = g(f(g(x))). %Y A239758 Cf. A000248, A000949. %K A239758 nonn,more %O A239758 0,3 %A A239758 _Chad Brewbaker_, Mar 26 2014 %E A239758 a(6)-a(7) from _Giovanni Resta_, Mar 28 2014