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A369404
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a(n) = 3*2^n + 5*(-1)^n.
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1
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8, 1, 17, 19, 53, 91, 197, 379, 773, 1531, 3077, 6139, 12293, 24571, 49157, 98299, 196613, 393211, 786437, 1572859, 3145733, 6291451, 12582917, 25165819, 50331653, 100663291, 201326597, 402653179, 805306373, 1610612731, 3221225477, 6442450939, 12884901893
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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) = a(n-1) + 2*a(n-2).
G.f.: (8 - 7*x)/((1 + x)*(1 - 2*x)).
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MATHEMATICA
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PROG
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(Python)
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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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