a(n) = (10*n + 2)^6.

Terms

a(0) =64a(1) =2985984a(2) =113379904a(3) =1073741824a(4) =5489031744a(5) =19770609664a(6) =56800235584a(7) =139314069504a(8) =304006671424a(9) =606355001344