216^(n-1) =
3*6^n * 2^(2n-1)*3^(2n+1)
= (6³)^(n-1) =
3*(2*3)^n * 2^(2n-1) * 3^(2n+1)
= (2*3)^(3(n-1)) = 2^(3n-3) * 3^(3n-3) =
3*2^n*3^n*2^(2n-1) * 3^(2n+1) 3^(1+n+2n+1) * 2^(n+2n-1)
= 2^(3n-3) * 3^(3n-3) = 2^(3n-3-3n+1) * 3^(3n-3-3n-2) =
3^(3n+2) * 2^(3n-1)
=2⁻² * 3⁻⁵ = 1 = 1 = 1
2² * 3⁵ 4*243 972