a(n) = 361*n^2 + 19.

Terms

a(0) =19a(1) =380a(2) =1463a(3) =3268a(4) =5795a(5) =9044a(6) =13015a(7) =17708a(8) =23123a(9) =29260a(10) =36119a(11) =43700a(12) =52003a(13) =61028a(14) =70775a(15) =81244a(16) =92435a(17) =104348a(18) =116983a(19) =130340a(20) =144419a(21) =159220a(22) =174743a(23) =190988a(24) =207955a(25) =225644a(26) =244055a(27) =263188a(28) =283043a(29) =303620