%I #12 Apr 22 2019 11:46:36
%S 2,2,1,4,11,24,47,99,211,437,909,1925
%N a(n) is the number of canonical polygons with 2n edges having exactly 2 lines of reflection symmetry.
%H Lars Blomberg, <a href="/A307456/a307456.pdf">Examples of canonical polygons with exactly 2 lines of reflection symmetry</a>
%Y Cf. A052436, A307387, A307391, A307426, A307454, A307455, A307456, A307519.
%K nonn,more
%O 2,1
%A _Lars Blomberg_, Apr 09 2019