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Search: id:A053209
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| 1, 5, 14, 32, 68, 140, 284, 572, 1148, 2300, 4604, 9212, 18428, 36860, 73724, 147452, 294908, 589820, 1179644, 2359292, 4718588, 9437180, 18874364, 37748732, 75497468, 150994940, 301989884, 603979772, 1207959548, 2415919100
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OFFSET
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0,2
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FORMULA
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a(0) = 1, a(1) = 5, a(n+1) = 2*a(n) + 4, for n >= 1; a(n) = 9*2^(n-1) - 4, n >= 1.
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MATHEMATICA
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a=5; lst={1, a}; k=9; Do[a+=k; AppendTo[lst, a]; k+=k, {n, 0, 5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 16 2008]
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CROSSREFS
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Cf. A051598, A053208.
Sequence in context: A064412 A139754 A036595 this_sequence A014302 A038090 A094002
Adjacent sequences: A053206 A053207 A053208 this_sequence A053210 A053211 A053212
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KEYWORD
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nonn,easy
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AUTHOR
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Asher Auel (asher.auel(AT)reed.edu) Dec 14, 1999
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