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

0,3

LINKS

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

CROSSREFS

Cf. A181162.

Sequence in context: A187652 A007816 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 January 26 17:21 EST 2020. Contains 331280 sequences. (Running on oeis4.)