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%I #17 Apr 22 2019 11:46:48
%S 2,2,7,22,79,289,1145,4655,19314,81242,345785,1484065,6414999,27895652
%N a(n) is the number of canonical polygons with 4n edges having 4-fold rotational symmetry.
%H Lars Blomberg, <a href="/A307426/a307426.pdf">Examples of canonical polygons with 4-fold rotational symmetry</a>
%Y Cf. A052436, A307387, A307391, A307426, A307454, A307455, A307456, A307519.
%K nonn,more
%O 1,1
%A _Lars Blomberg_, Apr 08 2019
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