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

Terms

a(0) =1a(1) =2a(2) =9a(3) =730a(4) =21953a(5) =274626a(6) =2000377a(7) =10218314a(8) =40707585a(9) =135005698a(10) =389017001a(11) =1003003002a(12) =2363266369a(13) =5168743490a(14) =10618986393a(15) =20683643626a(16) =38477541377a(17) =68769820674a(18) =118660303945a(19) =198461344538a(20) =322828856001a(21) =512192024002