A163859 Number of different cubes of mappings of a finite set of n elements into itself.

1, 1, 4, 19, 116, 985, 11026, 145621, 2199240, 37942785, 743755750

Offset

0,3

Comments

The same as A102687, but now for cubic compositions, a(n) is the number of different mappings g that admit at least one mapping f as the cubic root (g=fofof) in terms of the composition.

Links

Table of n, a(n) for n=0..10.

Crossrefs

Column k=3 of A247026.

Sequence in context: A060907 A245505 A247056 * A197660 A354458 A361532

Adjacent sequences: A163856 A163857 A163858 * A163860 A163861 A163862

Keyword

more,nonn

Author

Carlos Alves, Aug 05 2009

Extensions

a(0) from Alois P. Heinz, Sep 09 2014

a(8)-a(10) from Bert Dobbelaere, Jan 24 2019

Status

approved