a(1) = 2, a(n) = (n-th-even n^3) - (sum of previous terms).

Terms

a(0) =2a(1) =6a(2) =56a(3) =152a(4) =296a(5) =488a(6) =728a(7) =1016a(8) =1352a(9) =1736a(10) =2168a(11) =2648a(12) =3176a(13) =3752a(14) =4376a(15) =5048a(16) =5768a(17) =6536a(18) =7352a(19) =8216a(20) =9128a(21) =10088a(22) =11096a(23) =12152a(24) =13256a(25) =14408a(26) =15608a(27) =16856a(28) =18152a(29) =19496