a(n) = (2*n)^6.

Terms

a(0) =0a(1) =64a(2) =4096a(3) =46656a(4) =262144a(5) =1000000a(6) =2985984a(7) =7529536a(8) =16777216a(9) =34012224a(10) =64000000a(11) =113379904a(12) =191102976a(13) =308915776a(14) =481890304a(15) =729000000a(16) =1073741824a(17) =1544804416a(18) =2176782336a(19) =3010936384a(20) =4096000000a(21) =5489031744a(22) =7256313856a(23) =9474296896a(24) =12230590464a(25) =15625000000