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A153972
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a(n+1)=2*(a(n)-2)-2,a(0)=7.
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1
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7, 8, 10, 14, 22, 38, 70, 134, 262, 518, 1030, 2054, 4102, 8198, 16390, 32774, 65542, 131078, 262150, 524294, 1048582, 2097158, 4194310, 8388614, 16777222, 33554438, 67108870, 134217734, 268435462, 536870918, 1073741830, 2147483654
(list; graph; refs; listen; history; internal format)
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