a(n) = 36*n^2 - 4*n (n>=1).

Terms

a(0) =32a(1) =136a(2) =312a(3) =560a(4) =880a(5) =1272a(6) =1736a(7) =2272a(8) =2880a(9) =3560a(10) =4312a(11) =5136a(12) =6032a(13) =7000a(14) =8040a(15) =9152a(16) =10336a(17) =11592a(18) =12920a(19) =14320a(20) =15792a(21) =17336a(22) =18952a(23) =20640a(24) =22400a(25) =24232a(26) =26136a(27) =28112a(28) =30160a(29) =32280