J. B. Hendrickson and C. A. Parks, "Generation and Enumeration of Carbon skeletons", J. Chem. Inf. Comput. Sci, vol. 31 (1991) pp. 101-107. See Table 2, column 4 on page 103.
Table of n, a(n) for n=0..19.
Michael A. Kappler, GENSMI: Exhaustive Enumeration of Simple Graphs.
A036671 is the equivalent with one cycle.
Sequence in context: A081495 A191645 A146240 * A146271 A145371 A112044
Adjacent sequences: A112407 A112408 A112409 * A112411 A112412 A112413
Jonathan Vos Post, Dec 08 2005