A121071 Nonisomorphic catacondensed monoheptafusenes (see reference for precise definition).

0, 0, 2, 6, 32, 132, 600, 2628, 11768, 52608, 237266

Offset

0,3

References

B. N. Cyvin et al., A class of polygonal systems representing polycyclic conjugated hydrocarbons ..., Monat. f. Chemie, 125 (1994), 1327-1337 (see Table 1).

S. J. Cyvin et al., Enumeration and classification of certain polygonal systems... : annelated catafusenes, J. Chem. Inform. Comput. Sci., 34 (1994), 1174-1180.

Links

Table of n, a(n) for n=0..10.

Formula

See A044046 for g.f. and other formulas.

Crossrefs

Equals twice A044046.

Sequence in context: A108327 A188573 A196010 * A092199 A108485 A378337

Adjacent sequences: A121068 A121069 A121070 * A121072 A121073 A121074

Keyword

nonn

Author

N. J. A. Sloane

Status

approved