OFFSET
1,3
FORMULA
a(n) = A360871(n) + 1 for n > 1.
EXAMPLE
The a(3) = 3 multigraphs are:
- a single vertex with 3 loops;
- a triple edge;
- a single edge with a loop at each vertex.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Andrew Howroyd, Feb 27 2023
STATUS
approved