How do you find the nth term for the sequence 3 9 27 81 243?

How do you find the nth term for the sequence 3 9 27 81 243?
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According to Wittgenstein's Finite Rule Paradox every finite sequence of numbers can be a described in infinitely many ways - some simple, some complicated but all equally valid. One possible rule isT(n) = (2*n4 - 16*n3 + 52*n2 - 68*n + 33) for n = 1, 2, 3, ...Another is U(n) = 3n for n = 1, 2, 3, ...
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