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A122022
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a(0) = 0, a(1) = 1, a(2) = 2, a(3) = 1; for n > 3, a(n) = a(n - 1) - (n - 1)*a(n - 4).
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3
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0, 1, 2, 1, 1, -3, -13, -19, -26, -2, 115, 305, 591, 615, -880, -5150, -14015, -23855, -8895, 83805, 350090, 827190, 1013985, -829725, -8881795, -28734355, -54083980, -32511130, 207297335, 1011859275, 2580294695
(list; graph; refs; listen; history; internal format)
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