4^(n+1) - 4^(n-1) 4^n *(4-1/4) 15/4 15 * 16
---------------------- = ------------------ = ------------- = -----------= 15 * 4=60
4^(n-2) 4^n * 1/16 1/16 4
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4^(n+1) - 4^(n-1) 4^n *(4-1/4) 15/4 15 * 16
---------------------- = ------------------ = ------------- = -----------= 15 * 4=60
4^(n-2) 4^n * 1/16 1/16 4