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

Terms

a(0) =387199a(1) =1552321a(2) =3495367a(3) =6216337a(4) =9715231a(5) =13992049a(6) =19046791a(7) =24879457a(8) =31490047a(9) =38878561a(10) =47044999a(11) =55989361a(12) =65711647a(13) =76211857a(14) =87489991a(15) =99546049a(16) =112380031a(17) =125991937a(18) =140381767a(19) =155549521a(20) =171495199a(21) =188218801