Number of 1-sided polyedges with n edges.

Terms

a(0) =1a(1) =2a(2) =7a(3) =25a(4) =99a(5) =416a(6) =1854a(7) =8411a(8) =38980a(9) =182829a(10) =867096a(11) =4145168a(12) =19955321a(13) =96619260a(14) =470157772