a(n) = n^3 + (n+2)^3.

Terms

a(0) =8a(1) =28a(2) =72a(3) =152a(4) =280a(5) =468a(6) =728a(7) =1072a(8) =1512a(9) =2060a(10) =2728a(11) =3528a(12) =4472a(13) =5572a(14) =6840a(15) =8288a(16) =9928a(17) =11772a(18) =13832a(19) =16120a(20) =18648a(21) =21428a(22) =24472a(23) =27792a(24) =31400a(25) =35308a(26) =39528a(27) =44072a(28) =48952a(29) =54180