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A239760
Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(x) = f(f(g(x))).
1
1, 1, 10, 123, 1984, 38765, 899856, 24135055, 734381824, 24985937241, 939674886400, 38697245287811, 1731506682516480, 83631998873272837, 4336190248653942784, 240186479159794548375, 14153996066789439471616, 884109266328681103701425, 58346867827408911965945856
OFFSET
0,3
LINKS
CROSSREFS
Sequence in context: A246643 A233084 A081784 * A296190 A263552 A259839
KEYWORD
nonn
AUTHOR
Chad Brewbaker, Mar 26 2014
EXTENSIONS
a(6)-a(7) from Giovanni Resta, Mar 28 2014
More terms from David Einstein, Nov 15 2016
STATUS
approved