a(n) = n^6 + n^3 + 1.

Terms

a(0) =1a(1) =3a(2) =73a(3) =757a(4) =4161a(5) =15751a(6) =46873a(7) =117993a(8) =262657a(9) =532171a(10) =1001001a(11) =1772893a(12) =2987713a(13) =4829007a(14) =7532281a(15) =11394001a(16) =16781313a(17) =24142483a(18) =34018057a(19) =47052741a(20) =64008001a(21) =85775383a(22) =113390553a(23) =148048057a(24) =191116801a(25) =244156251a(26) =308933353