a(n) = 2*n*(4*n-3).

Terms

a(0) =0a(1) =2a(2) =20a(3) =54a(4) =104a(5) =170a(6) =252a(7) =350a(8) =464a(9) =594a(10) =740a(11) =902a(12) =1080a(13) =1274a(14) =1484a(15) =1710a(16) =1952a(17) =2210a(18) =2484a(19) =2774a(20) =3080a(21) =3402a(22) =3740a(23) =4094a(24) =4464a(25) =4850a(26) =5252a(27) =5670a(28) =6104a(29) =6554