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A239766
Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(f(x)) = f(g(g(x))).
0
1, 1, 10, 195, 5992, 260085, 14922576, 1087100371
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..7.
CROSSREFS
Cf.
A181162
.
Sequence in context:
A007816
A365176
A126463
*
A294047
A239768
A239769
Adjacent sequences:
A239763
A239764
A239765
*
A239767
A239768
A239769
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 13 11:30 EDT 2024. Contains 375905 sequences. (Running on oeis4.)