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A022405
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a(n) = a(n-1)*a(n-2)-a(n-3)
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1
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0, 1, 2, 2, 3, 4, 10, 37, 366, 13532, 4952675, 67019597734, 331926286207224918, 22245566178948766568816183137, 7383888166355511098764350563784314022618210032
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