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%I #39 Nov 14 2021 15:07:05
%S 0,0,1,3,3,9,13,52,140,501,1763,6785,25571,99907,392230,1564989,
%T 6297892,25601641,104846143,432629580
%N Number of canonical polygons of n sides.
%C There are exactly 8 convex canonical polygons: 1 with n=3, 3 with n=4, 1 with n=5, 2 with n=6, 1 with n=8. - _Ronald Kyrmse_, Aug 18 2021
%H Lars Blomberg, <a href="/A052436/a052436_1.pdf">Examples of Canonical Polygons for n = 3..20</a>
%H Sean A. Irvine, <a href="https://github.com/archmageirvine/joeis/blob/master/src/irvine/oeis/a052/A052436.java">Java program</a> (github)
%H Ronald Kyrmse, <a href="http://academia.edu/50936562">Canonical Polygons</a>.
%H Ronald Kyrmse, <a href="/A052436/a052436_2.pdf">Canonical Polygons</a>.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/BinomialCoefficient.html">Binomial Coefficient</a>.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/CanonicalPolygon.html">Canonical Polygon</a>.
%Y Cf. A307387, A307391, A307426, A307454, A307455, A307456, A307519.
%K nonn,more
%O 1,4
%A _Eric W. Weisstein_
%E Corrected and extended by Keith Schneider (schneidk(AT)email.unc.edu), Oct 25 2007
%E Offset changed to 1 and a(14)-a(18) from _Lars Blomberg_, Feb 18 2019
%E a(19)-a(20) from _Lars Blomberg_, Apr 23 2019
%E a(12) corrected by _Sean A. Irvine_, Nov 12 2021
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