a(n) = A001350(n)^4.

Terms

a(0) =1a(1) =1a(2) =256a(3) =625a(4) =14641a(5) =65536a(6) =707281a(7) =4100625a(8) =33362176a(9) =214358881a(10) =1568239201a(11) =10485760000a(12) =73680216481a(13) =500246412961