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A051633
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a(n) = 5*2^n - 2.
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8
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3, 8, 18, 38, 78, 158, 318, 638, 1278, 2558, 5118, 10238, 20478, 40958, 81918, 163838, 327678, 655358, 1310718, 2621438, 5242878, 10485758, 20971518, 41943038, 83886078, 167772158, 335544318, 671088638, 1342177278, 2684354558, 5368709118, 10737418238, 21474836478
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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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G.f.: ( 3-x ) / ( (2*x-1)*(x-1) ). - R. J. Mathar, Mar 23 2023
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EXAMPLE
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a(5) = 5*2^4 - 2 = 80 - 2 = 78.
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MATHEMATICA
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LinearRecurrence[{3, -2}, {3, 8}, 30] (* Ray Chandler, Jul 18 2020 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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