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Search: id:A137480
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| 12, 21, 48, 84, 192, 336, 768, 1344, 3072, 5376, 12288
(list; graph; listen)
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OFFSET
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0,1
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FORMULA
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G.f.: (21*x + 12)/(-4*x^2 + 1). a(n) = -(9/4)*sqrt(2)*(1/2)^(-1/2*(-1)^n)*(-2)^n+(33/4)*2^n*sqrt(2)*(1/2)^(-(1/2)*(-1)^n) - Alexander R. Povolotsky (pevnev(AT)juno.com), Apr 25 2008
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CROSSREFS
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Adjacent sequences: A137477 A137478 A137479 this_sequence A137481 A137482 A137483
Sequence in context: A132132 A085926 A071263 this_sequence A048344 A039402 A043225
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KEYWORD
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nonn
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Apr 22 2008
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