a(n) = (6*n)^3.

Terms

a(0) =0a(1) =216a(2) =1728a(3) =5832a(4) =13824a(5) =27000a(6) =46656a(7) =74088a(8) =110592a(9) =157464a(10) =216000a(11) =287496a(12) =373248a(13) =474552a(14) =592704a(15) =729000a(16) =884736a(17) =1061208a(18) =1259712a(19) =1481544a(20) =1728000a(21) =2000376a(22) =2299968a(23) =2628072a(24) =2985984a(25) =3375000a(26) =3796416a(27) =4251528a(28) =4741632a(29) =5268024