a(n) = 388962*n^2 + 1764*n + 1.

Terms

a(0) =390727a(1) =1559377a(2) =3505951a(3) =6230449a(4) =9732871a(5) =14013217a(6) =19071487a(7) =24907681a(8) =31521799a(9) =38913841a(10) =47083807a(11) =56031697a(12) =65757511a(13) =76261249a(14) =87542911a(15) =99602497a(16) =112440007a(17) =126055441a(18) =140448799a(19) =155620081a(20) =171569287a(21) =188296417