OFFSET
3,3
LINKS
S. J. Cyvin, F. Zhang and J. Brunvoll, Enumeration of perifusenes with one internal vertex: A complete mathematical solution, J. Math. Chem., 11 (1992), 283-292.
FORMULA
a(n) = A038380(n) for n >= 3. - Georg Fischer, Nov 02 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 24 2006
STATUS
approved