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A239782
Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(g(f(x))) = f(f(g(x))).
0
1, 1, 14, 321, 12256, 682985, 52551216, 5333977789
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..7.
CROSSREFS
Cf.
A181162
.
Sequence in context:
A303488
A341501
A255857
*
A294040
A035018
A264177
Adjacent sequences:
A239779
A239780
A239781
*
A239783
A239784
A239785
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 11:16 EDT 2024. Contains 371967 sequences. (Running on oeis4.)