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A235325
Number of ordered pairs of endofunctions f,g on a set of n elements satisfying f(f(x)) = g(g(g(x))).
0
1, 1, 4, 51, 1072, 31845, 1292616, 68464207, 4555593904, 369790197705
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..9.
CROSSREFS
Cf.
A000248
,
A000949
.
Sequence in context:
A343572
A336608
A349653
*
A230401
A293075
A300732
Adjacent sequences:
A235322
A235323
A235324
*
A235326
A235327
A235328
KEYWORD
nonn
,
more
AUTHOR
Chad Brewbaker
, Mar 26 2014
EXTENSIONS
a(6)-a(7) from
Giovanni Resta
, Mar 26 2014
a(8)-a(9) from
Giovanni Resta
, Mar 28 2014
STATUS
approved
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Last modified September 29 23:48 EDT 2023. Contains 365781 sequences. (Running on oeis4.)