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A172252
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a(n) = 4*2^n - 9.
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1
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-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
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OFFSET
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1,2
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LINKS
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FORMULA
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MATHEMATICA
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Table[4 2^n - 9, {n, 1, 100}]
LinearRecurrence[{3, -2}, {-1, 7}, 30] (* Harvey P. Dale, May 27 2021 *)
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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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