OFFSET
0,5
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. 273, fourth table.
Andrew Howroyd, PARI Program
FORMULA
a(2*n-1) = b(2*n-1), a(2*n) = b(2*n) - (A053465(n) - a(n))/2 where b is the Inverse Euler transform of A004104. - Andrew Howroyd, Jan 27 2020
PROG
(PARI) \\ See link for program.
A320499seq(20) \\ Andrew Howroyd, Jan 27 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 26 2018
EXTENSIONS
Dead sequence restored by Andrew Howroyd, Jan 26 2020
a(0)=1 prepended and terms a(13) and beyond from Andrew Howroyd, Jan 26 2020
STATUS
approved