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A090409
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7*8^n/9+2(-1)^n/9.
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2
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1, 6, 50, 398, 3186, 25486, 203890, 1631118, 13048946, 104391566, 835132530, 6681060238, 53448481906, 427587855246, 3420702841970, 27365622735758, 218924981886066, 1751399855088526, 14011198840708210, 112089590725665678
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OFFSET
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0,2
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LINKS
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FORMULA
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G.f.: ( -1+x ) / ( (1+x)*(8*x-1) ). - R. J. Mathar, Dec 10 2014
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MATHEMATICA
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LinearRecurrence[{7, 8}, {1, 6}, 20] (* Harvey P. Dale, Aug 15 2016 *)
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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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