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A239763
Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(f(x)) = f(g(x)).
0
1, 1, 10, 171, 4600, 168285, 7988736, 472245991
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..7.
CROSSREFS
Cf.
A181162
.
Sequence in context:
A187204
A346458
A133273
*
A112703
A132676
A270958
Adjacent sequences:
A239760
A239761
A239762
*
A239764
A239765
A239766
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 April 25 04:42 EDT 2024. Contains 371964 sequences. (Running on oeis4.)