OFFSET
1,3
REFERENCES
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
N. C. Wormald, Counting labelled chordal graphs. Graphs Combin. 1 (1985), no. 2, 193-200.
CROSSREFS
KEYWORD
nonn,nice
AUTHOR
EXTENSIONS
a(14)-a(15) from Brendan McKay, Jun 05 2021
STATUS
approved