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A307519 a(n) is the number of canonical polygons with 4n edges having exactly 4 lines of reflection symmetry.

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%I A307519 #12 Apr 22 2019 11:46:32
%S A307519 2,1,2,6,10,17,34,72,142,288,585,1195,2413,4898
%N A307519 a(n) is the number of canonical polygons with 4n edges having exactly 4 lines of reflection symmetry.
%H A307519 Lars Blomberg, <a href="/A307519/a307519.pdf">Examples of canonical polygons with exactly 4 lines of reflection symmetry</a>
%Y A307519 Cf. A052436, A307387, A307391, A307426, A307454, A307455, A307456, A307519.
%K A307519 nonn,more
%O A307519 1,1
%A A307519 _Lars Blomberg_, Apr 12 2019