a(n) is the number of edges formed by n-secting the angles of a hexagon.

Terms

a(0) =6a(1) =12a(2) =126a(3) =42a(4) =366a(5) =318a(6) =762a(7) =432a(8) =1278a(9) =1152a(10) =1950a(11) =1338a(12) =2658a(13) =2550a(14) =3642a(15) =2808a(16) =4590a(17) =4500a(18) =5898a(19) =4734a(20) =7086a(21) =6978a(22) =8706a(23) =7344a(24) =10134a(25) =9876a(26) =12066a(27) =10422a(28) =13710a(29) =13374