OFFSET
1,3
COMMENTS
A polypentagram is a plane figure made of five-pointed stars joined edge to edge. Free means that mirror images are counted as the same polypentagram.
LINKS
George Sicherman, Catalogue of Polypentagrams
EXAMPLE
Five different figures can be formed by joining 3 pentagrams, so a(3) = 5.
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
George Sicherman, Feb 01 2013
EXTENSIONS
a(6)-a(11) from Aaron N. Siegel, May 23 2022
STATUS
approved