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A044048 Catafusenes (see reference for precise definition). 1
1, 1, 3, 10, 37, 149, 630, 2713, 11899, 52789, 236345, 1066317, 4842531, 22117897, 101535659, 468233674, 2168094625, 10076216851, 46986691678, 219777820957, 1030892924479, 4848040645676, 22853639788127, 107970205586283 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
REFERENCES
S. J. Cyvin et al., Enumeration and classification of certain polygonal systems...: annelated catafusenes, J. Chem. Inform. Comput. Sci., 34 (1994), 1174-1180.
LINKS
FORMULA
G.f.: (6 - 18x^3 - (1-x)*(1-2x)*f(x) - 3*(1+2x)*f(x^2) - 2*f(x^3))/(12x^3), where f(x) = sqrt(1 - 6x + 5x^2) (follows from eq. (26) in Cyvin et al.).
CROSSREFS
Sequence in context: A063029 A199874 A151058 * A192240 A231894 A086444
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Emeric Deutsch, Mar 14 2004
STATUS
approved

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Last modified June 16 16:46 EDT 2024. Contains 373432 sequences. (Running on oeis4.)