OFFSET
1,2
COMMENTS
In other words, number of closed trails up to cyclic rotations (cf. A357855).
EXAMPLE
For n = 3, we have 5 circuits: 3 of length 0 (singleton vertices), and 2 of length 3 (1->2->3->1 and 1->3->2->1).
CROSSREFS
KEYWORD
nonn,more,walk
AUTHOR
Max Alekseyev, Oct 16 2022
EXTENSIONS
a(9) from Bert Dobbelaere, Oct 17 2022
STATUS
approved