Round((n+1/n)^8).

Terms

a(0) =256a(1) =1526a(2) =15242a(3) =106442a(4) =534597a(5) =2091240a(6) =6776036a(7) =18992711a(8) =47486564a(9) =108285671a(10) =228948163a(11) =454458310a(12) =855154435a(13) =1537112038a(14) =2655445795a(15) =4431034438a(16) =7171212835a(17) =11295015910a(18) =17363599363a(19) =26116502470a(20) =38514458563