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A239785
Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(g(g(x))) = f(g(x)).
4
1, 1, 14, 411, 19912, 1412745, 136537056, 17121680443
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..7.
CROSSREFS
Cf.
A181162
.
Sequence in context:
A041364
A353609
A222904
*
A275025
A236156
A258392
Adjacent sequences:
A239782
A239783
A239784
*
A239786
A239787
A239788
KEYWORD
nonn
,
more
AUTHOR
Chad Brewbaker
, Mar 26 2014
EXTENSIONS
a(6)-a(7) from
Giovanni Resta
, Mar 28 2014
STATUS
approved
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Last modified August 30 19:17 EDT 2024. Contains 375545 sequences. (Running on oeis4.)