a(n) = 12*n^2 + 10*n - 30.

Terms

a(0) =-30a(1) =-8a(2) =38a(3) =108a(4) =202a(5) =320a(6) =462a(7) =628a(8) =818a(9) =1032a(10) =1270a(11) =1532a(12) =1818a(13) =2128a(14) =2462a(15) =2820a(16) =3202a(17) =3608a(18) =4038a(19) =4492a(20) =4970a(21) =5472a(22) =5998a(23) =6548a(24) =7122a(25) =7720a(26) =8342a(27) =8988a(28) =9658a(29) =10352