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EXAMPLE
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For 2 teams there are 2 outcomes that can be obtained in a single way: [0, 3] and [1, 1], so a(2) = 2.
For 3 teams there are 6 outcomes that can be obtained in a single way: [0, 3, 6], [1, 3, 4], [1, 1, 6], [1, 2, 4], [0, 4, 4] and [2, 2, 2], so a(3) is 6. Note that the outcome [3, 3, 3] can be obtained in two ways: (A beats B, B beats C, C beats A) or (B beats A, A beats C, C beats B).
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