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A239754
Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(g(f(x))) = g(g(g(x))).
0
1, 1, 8, 111, 2896, 119985, 7180776, 581563129
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..7.
CROSSREFS
Cf.
A000248
,
A000949
.
Sequence in context:
A079660
A131621
A364983
*
A003721
A281951
A316179
Adjacent sequences:
A239751
A239752
A239753
*
A239755
A239756
A239757
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 September 19 01:02 EDT 2024. Contains 376002 sequences. (Running on oeis4.)