OFFSET
0,1
COMMENTS
Isomorphism is up to permutation of the elements of the n-set.
a(6) has 214 decimal digits.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..6
EXAMPLE
The a(2)=4 sets with permutations shown in cycle notation are:
{},
{(1)(2)},
{(12)},
{(1)(2), (12)}.
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Howroyd, May 03 2023
STATUS
approved