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A122739
Numbers of perifusenes with one internal vertex (see Cyvin et al. for precise definition).
0
1, 1, 6, 24, 109, 477, 2155, 9647, 43621, 197767, 901436, 4125636, 18964119
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
Cf. A038380.
Sequence in context: A026962 A026972 A075484 * A038380 A052745 A187668
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 24 2006
STATUS
approved