OFFSET
3,3
REFERENCES
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
B. R. Heap, The enumeration of homeomorphically irreducible star graphs, J. Math. Phys., 7 (1966), 1582-1587.
CROSSREFS
KEYWORD
nonn,nice,more
AUTHOR
EXTENSIONS
a(13)-a(17) from Sean A. Irvine, May 18 2020
a(18) from Andrew Howroyd, Feb 25 2023
STATUS
approved
