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

Terms

a(0) =64a(1) =262144a(2) =7529536a(3) =64000000a(4) =308915776a(5) =1073741824a(6) =3010936384a(7) =7256313856a(8) =15625000000a(9) =30840979456a(10) =56800235584a(11) =98867482624a(12) =164206490176a(13) =262144000000a(14) =404567235136a(15) =606355001344a(16) =885842380864