A121180 Alkane systems (see Cyvin reference for precise definition).

0, 0, 0, 1, 1, 5, 6, 26, 32, 133, 176, 708, 952, 3861, 5302, 21604, 29960

Offset

1,6

Comments

Appears to be A047774 without every third term (all omitted terms are zeros). - Andrey Zabolotskiy, Jul 29 2023

Links

Table of n, a(n) for n=1..17.

S. J. Cyvin, Jianji Wang, J. Brunvoll, Shiming Cao, Ying Li, B. N. Cyvin, and Yugang Wang, Staggered conformers of alkanes: complete solution of the enumeration problem, J. Molec. Struct. 413-414 (1997), 227-239. See Table 5, column C_2.

Crossrefs

Cf. other columns of Cyvin et al.'s Table 5: A027610 (spectral isomers), A007173 (stereoisomers), A047775 (C_s), A047772 (C_i), A047774 (C_3, apparently), A047767 (C_{2h}), A047761 (C_{2v}), A047773 (C_{3v}, apparently).

Cf. A121181, A121189.

Sequence in context: A137081 A137079 A163658 * A022165 A342775 A022163

Adjacent sequences: A121177 A121178 A121179 * A121181 A121182 A121183

Keyword

nonn,more

Author

N. J. A. Sloane, Aug 17 2006

Status

approved