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A121122
Related to enumeration of free catapolyoctagons (see Cyvin reference for precise definition).
0
0, 2, 14, 106, 801, 6341, 51632, 431503, 3678308, 31873041, 279902507, 2485759768, 22286120125, 201441772806, 1833727566167, 16796110395426, 154687931712684, 1431579231342976, 13306513476718812, 124169476411774978, 1162801650307216975, 10924388061524347004
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 (1997), 55-70, Table IV ^qC_r.
FORMULA
a(n) = (A036758(n)-A036759(n))/2 [Cyvin eq. (48)] . - R. J. Mathar, Jul 31 2019
CROSSREFS
Sequence in context: A160780 A279737 A122680 * A026293 A051708 A355362
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Aug 13 2006
STATUS
approved