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A253210
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a(n) = 7^n + 6.
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2
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7, 13, 55, 349, 2407, 16813, 117655, 823549, 5764807, 40353613, 282475255, 1977326749, 13841287207, 96889010413, 678223072855, 4747561509949, 33232930569607, 232630513987213, 1628413597910455, 11398895185373149, 79792266297612007, 558545864083284013
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OFFSET
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0,1
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COMMENTS
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LINKS
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FORMULA
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G.f.: (7 - 43*x) / ((1 - x)*(1 - 7*x)).
a(n) = 8*a(n-1) - 7*a(n-2) for n>1.
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MATHEMATICA
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Table[7^n + 6, {n, 0, 30}]
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PROG
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(Magma) [7^n+6: n in [0..30]];
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CROSSREFS
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Cf. similar sequences listed in A253208.
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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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