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A153973
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a(n+1)=2*(a(n)-2)-2,a(0)=9.
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0
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9, 12, 18, 30, 54, 102, 198, 390, 774, 1542, 3078, 6150, 12294, 24582, 49158, 98310, 196614, 393222, 786438, 1572870, 3145734, 6291462, 12582918, 25165830, 50331654, 100663302, 201326598, 402653190, 805306374, 1610612742, 3221225478
(list; graph; refs; listen; history; internal format)
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