OFFSET
0,4
EXAMPLE
a(6) = 5 because the Lucas number L(6) (starting at L(0) = 2) is 18 and there are 5 groups of order 18.
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Jonathan Vos Post, Aug 02 2008
EXTENSIONS
a(16)-a(29) from Eric M. Schmidt, Jun 20 2014
STATUS
approved