a(n) = 64*n^2 - 2*n.

Terms

a(0) =62a(1) =252a(2) =570a(3) =1016a(4) =1590a(5) =2292a(6) =3122a(7) =4080a(8) =5166a(9) =6380a(10) =7722a(11) =9192a(12) =10790a(13) =12516a(14) =14370a(15) =16352a(16) =18462a(17) =20700a(18) =23066a(19) =25560a(20) =28182a(21) =30932a(22) =33810a(23) =36816a(24) =39950a(25) =43212a(26) =46602a(27) =50120a(28) =53766a(29) =57540