A sequence satisfies a(1) = 1 and a(n) = 3 \cdot a(n-1) for n \ge 2 . Wh...

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A sequence satisfies a(1) = 1 and a(n) = 3 \cdot a(n-1) for n \ge 2. Which closed form matches it?

a(n) = n(n+1)/2

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a(n) = 2^{n-1}

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a(n) = 2n

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a(n) = n^2

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a(n) = 3^{n-1}

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a(n) = 2n - 1

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