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What are the first, fourth and eighth terms for A(n)=-2*2^n-1

What are the first, fourth and eighth terms for A(n)=-2*2^n-1
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What are the first, fourth and eighth terms for A(n)=-2*2^n-1

User Inor
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The first term is -2. The fourth term is -16. And the last term is -256.
To find them, lets say the first term, replace n with 1. You can use this idea to find out the rest (which I've already done, but just to explain to you.).
User Hakro
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