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A239765
Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(f(g(x))) = g(g(g(x))).
0
1, 1, 10, 189, 6304, 315065, 21848976, 1992930037
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..7.
CROSSREFS
Cf.
A181162
.
Sequence in context:
A121973
A223146
A365175
*
A006409
A173813
A249643
Adjacent sequences:
A239762
A239763
A239764
*
A239766
A239767
A239768
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 18 09:46 EDT 2024. Contains 375999 sequences. (Running on oeis4.)