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A135520
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a(n) = 4*a(n-2).
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9
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2, 1, 8, 4, 32, 16, 128, 64, 512, 256, 2048, 1024, 8192, 4096, 32768, 16384, 131072, 65536, 524288, 262144, 2097152, 1048576, 8388608, 4194304, 33554432, 16777216, 134217728, 67108864, 536870912, 268435456, 2147483648, 1073741824
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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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O.g.f.: (5/(1-2*x) + 3/(1+2*x))/4.
a(n) = (5*2^n + 3*(-2)^n)/4.
E.g.f.: (1/4)*(5*exp(2*x) + 3*exp(-2*x)). - G. C. Greubel, Oct 17 2016
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MAPLE
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MATHEMATICA
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LinearRecurrence[{1, 4, -4}, {2, 1, 8}, 40] (* Harvey P. Dale, May 25 2012 *)
LinearRecurrence[{0, 4}, {2, 1}, 32] (* Ray Chandler, Aug 03 2015 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy,less
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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