

A362766


Number of nonisomorphic sets of permutations of an nset.


2




OFFSET

0,1


COMMENTS

Isomorphism is up to permutation of the elements of the nset.
a(6) has 214 decimal digits.


LINKS



FORMULA



EXAMPLE

The a(2)=4 sets with permutations shown in cycle notation are:
{},
{(1)(2)},
{(12)},
{(1)(2), (12)}.


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



