OFFSET
0,2
LINKS
Edward A. Bender and E. Rodney Canfield, Enumeration of connected invariant graphs, Journal of Combinatorial Theory, Series B 34.3 (1983): 268-278. See p. 275.
Andrew Howroyd, PARI Program
FORMULA
PROG
(PARI) \\ See link for program.
A320491seq(20) \\ Andrew Howroyd, Jan 28 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 25 2018
EXTENSIONS
Dead sequence restored, corrected and extended by Andrew Howroyd, Jan 28 2020
STATUS
approved