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

0,3

LINKS

Table of n, a(n) for n=0..9.

CROSSREFS

Cf. A000248, A000949.

Sequence in context: A215639 A320645 A328931 * 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 February 17 02:22 EST 2020. Contains 331976 sequences. (Running on oeis4.)