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Search: id:A053208
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| 0, 3, 10, 24, 52, 108, 220, 444, 892, 1788, 3580, 7164, 14332, 28668, 57340, 114684, 229372, 458748, 917500, 1835004, 3670012, 7340028, 14680060, 29360124, 58720252, 117440508, 234881020, 469762044, 939524092, 1879048188
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OFFSET
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0,2
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FORMULA
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a(0) = 0, a(1) = 3, a(n+1) = 2*a(n) + 4, for n >= 1; a(n) = 7*2^(n-1) - 4, n >= 1.
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MATHEMATICA
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a=3; lst={0, a}; k=7; 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. A053207, A053209.
Sequence in context: A144413 A033811 A062446 this_sequence A162607 A047667 A000247
Adjacent sequences: A053205 A053206 A053207 this_sequence A053209 A053210 A053211
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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 13, 1999
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