OFFSET
1,6
COMMENTS
The number of holes h = e - v + 1 (e = the number of edges and v the number of vertices). - John Mason, Feb 12 2023
LINKS
John Mason, Examples of size 6
EXAMPLE
The 4-stick with a cycle is the unit square. The 5-stick with a cycle is the unit square with one protruding edge. The 10 6-sticks with a cycle are the unit square with two protruding edges (in various cis, meta, trans configurations) or with a protruding 2-stick at various angles, or a 2x1 rectangle.
Size 6 examples 1 through 5:
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Examples 6 through 10:
+ +-+ + + +-+-+ +-+-+
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CROSSREFS
KEYWORD
nonn,more
AUTHOR
R. J. Mathar, Sep 30 2021
EXTENSIONS
a(14)-a(18) from John Mason, Jun 01 2023
STATUS
approved