OFFSET
0,3
COMMENTS
LINKS
Tilman Piesk, Formulas in predicate logic (Wikiversity)
Tilman Piesk, Image of a cocoon concertina square with 13 edges
Tilman Piesk, Lists of edges for n=2..5
Tilman Piesk, Python code used to generate the sequence
EXAMPLE
The cocoon concertina square has the A300693(2) = 6 outer and 7 inner edges, giving a(n) = 13 in total.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Tilman Piesk, Mar 24 2018
STATUS
approved