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A239784 Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(g(g(x))) = f(g(f(x))). 0
1, 1, 14, 351, 14776, 902605, 75313056, 8194699387 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
CROSSREFS
Cf. A181162.
Sequence in context: A020143 A161927 A253457 * A113673 A184268 A223383
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 February 23 07:33 EST 2024. Contains 370269 sequences. (Running on oeis4.)