a(n) = 4*n^2 + 24*n + 8.

Terms

a(0) =36a(1) =72a(2) =116a(3) =168a(4) =228a(5) =296a(6) =372a(7) =456a(8) =548a(9) =648a(10) =756a(11) =872a(12) =996a(13) =1128a(14) =1268a(15) =1416a(16) =1572a(17) =1736a(18) =1908a(19) =2088a(20) =2276a(21) =2472a(22) =2676a(23) =2888a(24) =3108a(25) =3336a(26) =3572a(27) =3816a(28) =4068a(29) =4328