OFFSET
1,2
REFERENCES
S. J. Cyvin, B. N. Cyvin, and J. Brunvoll, Enumeration of tree-like octagonal systems: catapolyoctagons, ACH Models in Chem. 134(1) (1997), 55-70.
LINKS
J. Brunvoll, S. J. Cyvin, and B. N. Cyvin, Enumeration of tree-like octagonal systems, J. Math. Chem. 21 (1997), 193-196; see Section 3 (p. 194).
FORMULA
G.f. G(x) = G satisfies G = x * (1 + 5*G + 6*G^2 + G^3).
MAPLE
Order := 30: S := solve(series(G/(1+5*G+6*G^2+G^3), G)=x, G);
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
More terms from Emeric Deutsch, Feb 28 2004
STATUS
approved