OFFSET
0,6
COMMENTS
Number of connected quartic graphs with at most n nodes.
FORMULA
a(n) = Sum_{k=0..n} A006820(k). [corrected by Georg Fischer, Sep 28 2021]
CROSSREFS
KEYWORD
nonn
AUTHOR
Jonathan Vos Post, Feb 23 2010
EXTENSIONS
Corrected by Jason Kimberley, Mar 29 2010
STATUS
approved