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A198849
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a(n) = (11*6^n - 1)/5.
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1
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2, 13, 79, 475, 2851, 17107, 102643, 615859, 3695155, 22170931, 133025587, 798153523, 4788921139, 28733526835, 172401161011, 1034406966067, 6206441796403, 37238650778419, 223431904670515, 1340591428023091, 8043548568138547
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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) = 6*a(n-1) + 1.
a(n) = 7*a(n-1) - 6*a(n-2), n > 1.
G.f.: ( 2-x ) / ( (6*x-1)*(x-1) ). - R. J. Mathar, Oct 31 2011
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PROG
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(Magma) [(11*6^n-1)/5: n in [0..30]]
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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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STATUS
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approved
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