a(n) = (12*n)^3.

Terms

a(0) =0a(1) =1728a(2) =13824a(3) =46656a(4) =110592a(5) =216000a(6) =373248a(7) =592704a(8) =884736a(9) =1259712a(10) =1728000a(11) =2299968a(12) =2985984a(13) =3796416a(14) =4741632a(15) =5832000a(16) =7077888a(17) =8489664a(18) =10077696a(19) =11852352a(20) =13824000a(21) =16003008a(22) =18399744a(23) =21024576a(24) =23887872a(25) =27000000a(26) =30371328a(27) =34012224a(28) =37933056