18^(N+3)/(3^2n+5*2^n-2)
(3^n+3*3^n+3*2^n+3)/3^2n+5*2^n-2=3*32=96 3^n+3*3^n+3:3^2n+5=3^n+3+n+3-2n-5=3^1=3 2^n+3:2^n-2=2^n+3-n+2=2^5=32