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%I #74 Apr 22 2019 11:46:29
%S 1,9,191,8049,418184,24283599
%N a(n) is the number of canonical polygons with 4n alternating straight and diagonal edges.
%H Lars Blomberg, <a href="/A307387/a307387.pdf">Examples of canonical polygons with alternating straight and diagonal edges</a>
%Y Cf. A052436, A307387, A307391, A307426, A307454, A307455, A307456, A307519.
%K nonn,more
%O 1,2
%A _Lars Blomberg_, Apr 18 2019
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