A307387 - OEIS

%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