a(n) is the number of vertices formed by n-secting the angles of an octagon.

Terms

a(0) =8a(1) =9a(2) =24a(3) =89a(4) =328a(5) =57a(6) =624a(7) =577a(8) =744a(9) =993a(10) =1624a(11) =793a(12) =2240a(13) =2129a(14) =2464a(15) =2913a(16) =3936a(17) =2121a(18) =4816a(19) =4705a(20) =5192a(21) =5785a(22) =7224a(23) =5233a(24) =8312a(25) =8265a(26) =8928a(27) =9649a(28) =11520a(29) =8929