OFFSET
1,6
LINKS
Eric Weisstein's World of Mathematics, Halin Graph
Peter J. Taylor, Python program
EXAMPLE
a(4) = 1 (K_4)
a(5) = 1 (W_5)
a(6) = 2 (3-prism graph, W_6)
a(7) = 2 (W_7 and one other)
a(8) = 4 (W_8 and 3 others)
PROG
(Python) # See Taylor link
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, Aug 03 2021
EXTENSIONS
a(13) from Eric W. Weisstein, Aug 16 2021
a(14) from Eric W. Weisstein, Sep 29 2021
a(15)-a(24) from Peter J. Taylor, May 20 2023
STATUS
approved