a(n) = (10*n + 6)^6.

Terms

a(0) =46656a(1) =16777216a(2) =308915776a(3) =2176782336a(4) =9474296896a(5) =30840979456a(6) =82653950016a(7) =192699928576a(8) =404567235136a(9) =782757789696