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A155701
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a(n) = (4^n + 8)/3.
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4
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3, 4, 8, 24, 88, 344, 1368, 5464, 21848, 87384, 349528, 1398104, 5592408, 22369624, 89478488, 357913944, 1431655768, 5726623064, 22906492248, 91625968984, 366503875928, 1466015503704, 5864062014808, 23456248059224, 93824992236888, 375299968947544
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = 5*a(n-1) - 4*a(n-2) = 4*a(n-1) - 8.
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MAPLE
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MATHEMATICA
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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