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 A239755 #8 Jul 18 2014 12:34:02 %S A239755 1,1,8,123,2776,86265,3498336,179365669 %N A239755 Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(g(x)) = g(f(f(x))). %Y A239755 Cf. A000248, A000949. %K A239755 nonn,more %O A239755 0,3 %A A239755 _Chad Brewbaker_, Mar 26 2014 %E A239755 a(6)-a(7) from _Giovanni Resta_, Mar 28 2014