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 A239760 #17 Nov 16 2016 05:45:05 %S A239760 1,1,10,123,1984,38765,899856,24135055,734381824,24985937241, %T A239760 939674886400,38697245287811,1731506682516480,83631998873272837, %U A239760 4336190248653942784,240186479159794548375,14153996066789439471616,884109266328681103701425,58346867827408911965945856 %N A239760 Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(x) = f(f(g(x))). %H A239760 David Einstein, <a href="/A239760/b239760.txt">Table of n, a(n) for n = 0..100</a> %H A239760 David Einstein, <a href="https://github.com/deinst/oeis-function-identities/blob/master/Cyclic%20Count.ipynb">Sage notebook for A239760</a> %Y A239760 Cf. A000248, A000949. %K A239760 nonn %O A239760 0,3 %A A239760 _Chad Brewbaker_, Mar 26 2014 %E A239760 a(6)-a(7) from _Giovanni Resta_, Mar 28 2014 %E A239760 More terms from _David Einstein_, Nov 15 2016