Three-Step Sequence
Tribonacci is like Fibonacci, but each new number is the sum of the previous three. The sequence starts with T(0) = 0, T(1) = 1, and T(2) = 1. Given n, return T(n) using the rule T(n+3) = T(n) + T(n+1) + T(n+2).
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def tribonacci(n: int) -> int:
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