Number of fixed polyarcs with n cells.

Terms

a(0) =8a(1) =33a(2) =144a(3) =626a(4) =2808a(5) =13422a(6) =65488a(7) =326183a(8) =1650784a(9) =8444367a(10) =43629968a(11) =227105588a(12) =1190399144a(13) =6274864076