a(n) = 121*n^2 + 2*n.

Terms

a(0) =123a(1) =488a(2) =1095a(3) =1944a(4) =3035a(5) =4368a(6) =5943a(7) =7760a(8) =9819a(9) =12120a(10) =14663a(11) =17448a(12) =20475a(13) =23744a(14) =27255a(15) =31008a(16) =35003a(17) =39240a(18) =43719a(19) =48440a(20) =53403a(21) =58608a(22) =64055a(23) =69744a(24) =75675a(25) =81848a(26) =88263a(27) =94920a(28) =101819a(29) =108960