a(n) = A000217(n^3) - n^3.

Terms

a(0) =0a(1) =0a(2) =28a(3) =351a(4) =2016a(5) =7750a(6) =23220a(7) =58653a(8) =130816a(9) =265356a(10) =499500a(11) =885115a(12) =1492128a(13) =2412306a(14) =3763396a(15) =5693625a(16) =8386560a(17) =12066328a(18) =17003196a(19) =23519511a(20) =31996000a(21) =42878430a(22) =56684628a(23) =74011861a(24) =95544576a(25) =122062500a(26) =154449100a(27) =193700403a(28) =240934176a(29) =297399466