Degree of rational Poncelet porism of n-gon.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =8a(6) =9a(7) =12a(8) =15a(9) =16a(10) =21a(11) =24a(12) =24a(13) =32a(14) =36a(15) =36a(16) =45a(17) =48a(18) =48a(19) =60a(20) =66a(21) =64a(22) =75a(23) =84a(24) =81a(25) =96a(26) =105a(27) =96a(28) =120a(29) =128