4, 9, 35, 159, 951, 6931
ATQ, 2! + 2! = 4 3! + 3! = 12 4! + 4! = 48 5! + 5! = 240 6! + 6! = 1440 7! + 7! = 5040 Therefore, 12 should come in place of 9.
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