a(n) = (n^2+1)^2+1.

Terms

a(0) =2a(1) =5a(2) =26a(3) =101a(4) =290a(5) =677a(6) =1370a(7) =2501a(8) =4226a(9) =6725a(10) =10202a(11) =14885a(12) =21026a(13) =28901a(14) =38810a(15) =51077a(16) =66050a(17) =84101a(18) =105626a(19) =131045a(20) =160802a(21) =195365a(22) =235226a(23) =280901a(24) =332930a(25) =391877a(26) =458330a(27) =532901a(28) =616226a(29) =708965