Number of aperiodic n-gons.

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =10a(5) =42a(6) =357a(7) =2400a(8) =20142a(9) =180280a(10) =1814395a(11) =19944804a(12) =239500794a(13) =3113326062a(14) =43589143560a(15) =653834280960