A235326 Number of ordered pairs of endofunctions f,g on a set of n elements satisfying f(f(f(x))) = g(g(g(x))).

1, 1, 4, 51, 1504, 66525, 4196856, 359031967, 39705044464, 5476674540825

Offset

0,3

Links

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

Crossrefs

Cf. A000248, A000949.

Sequence in context: A293075 A300732 A220282 * A210834 A287231 A289708

Adjacent sequences: A235323 A235324 A235325 * A235327 A235328 A235329

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