a(n) = n^3 if n odd, 3*n^3/4 if n even.

Terms

a(0) =0a(1) =1a(2) =6a(3) =27a(4) =48a(5) =125a(6) =162a(7) =343a(8) =384a(9) =729a(10) =750a(11) =1331a(12) =1296a(13) =2197a(14) =2058a(15) =3375a(16) =3072a(17) =4913a(18) =4374a(19) =6859a(20) =6000a(21) =9261a(22) =7986a(23) =12167a(24) =10368a(25) =15625a(26) =13182a(27) =19683a(28) =16464a(29) =24389