a(n) = 8*n^2 - 7*n + 2.

Terms

a(0) =2a(1) =3a(2) =20a(3) =53a(4) =102a(5) =167a(6) =248a(7) =345a(8) =458a(9) =587a(10) =732a(11) =893a(12) =1070a(13) =1263a(14) =1472a(15) =1697a(16) =1938a(17) =2195a(18) =2468a(19) =2757a(20) =3062a(21) =3383a(22) =3720a(23) =4073a(24) =4442a(25) =4827a(26) =5228a(27) =5645a(28) =6078a(29) =6527