A239783 - OEIS

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A239783

Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(g(x)) = f(g(f(x))).

0

1, 1, 14, 339, 12496, 639005, 42829536, 3624387739

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

LINKS

Table of n, a(n) for n=0..7.

CROSSREFS

Sequence in context: A222984 A278194 A035273 * A020143 A161927 A253457

Adjacent sequences: A239780 A239781 A239782 * A239784 A239785 A239786

KEYWORD

nonn,more

AUTHOR

Chad Brewbaker, Mar 26 2014

EXTENSIONS

a(6)-a(7) from Giovanni Resta, Mar 28 2014

STATUS

approved