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%I #18 Oct 07 2022 09:09:36
%S 1,2,4,11,24,81,193,772,1920,8735,23040
%N a(n) is the number of n-gons in A000940 that display symmetry (reflection / rotation).
%F a(p) = (2^((p-1)/2)*((p-1)/2)!)/2 for prime p.
%e Of the A000940(6)=12 hexagons, 11 have symmetry and 1 is asymmetric, so a(6)=11.
%Y Cf. A000940.
%K nonn,more
%O 3,2
%A _Ian Mooney_, Mar 14 2021
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