OFFSET
1,2
COMMENTS
An n-are is a shape formed from an n-celled polyomino by removing half of each square cell in such a way that at least half of the original join between cells is retained.
REFERENCES
Enumeration attributed by Andrew Clarke to Brendan Owen.
LINKS
Andrew Clarke, Polyares
Andrew Clarke, Picture from Andrew Clarke's page showing the 9 polyares of order 3 when turning over is allowed.
Eric Weisstein's World of Mathematics, Polyare
CROSSREFS
KEYWORD
nonn,nice,more
AUTHOR
N. J. A. Sloane, Oct 29 2000
EXTENSIONS
Link updated by William Rex Marshall, Dec 16 2009
a(9)-a(11) from Sean A. Irvine, Jul 02 2022
a(12)-a(15) from John Mason, Mar 19 2023
STATUS
approved