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A185346
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a(n) = 2^n - 9.
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9
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-8, -7, -5, -1, 7, 23, 55, 119, 247, 503, 1015, 2039, 4087, 8183, 16375, 32759, 65527, 131063, 262135, 524279, 1048567, 2097143, 4194295, 8388599, 16777207, 33554423, 67108855, 134217719, 268435447, 536870903, 1073741815, 2147483639, 4294967287, 8589934583
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listen;
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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.: ( -8+17*x ) / ( (2*x-1)*(x-1) ). - R. J. Mathar, Dec 17 2012
a(n) = 2*a(n-1) + 9 with a(0) = -8.
a(n) = 3*a(n-1) - 2*a(n-2) for n > 1. (End)
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MAPLE
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MATHEMATICA
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Table[2^n - 9, {n, 0, 40}] (* T. D. Noe, Dec 04 2012 *)
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PROG
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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STATUS
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approved
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