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A164682
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a(n) = 2*a(n-2) for n > 2; a(1) = 5, a(2) = 8.
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4
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5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1024, 1280, 2048, 2560, 4096, 5120, 8192, 10240, 16384, 20480, 32768, 40960, 65536, 81920, 131072, 163840, 262144, 327680, 524288, 655360, 1048576, 1310720, 2097152, 2621440, 4194304
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OFFSET
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1,1
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COMMENTS
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Binomial transform is A135532 without initial terms -1, 3. Fourth binomial transform is A164537.
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LINKS
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FORMULA
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a(n) = (9-(-1)^n)*2^(1/4*(2*n-5+(-1)^n)).
G.f.: x*(5+8*x)/(1-2*x^2).
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MATHEMATICA
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LinearRecurrence[{0, 2}, {5, 8}, 60] (* Harvey P. Dale, Jul 20 2022 *)
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PROG
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(Magma) [ n le 2 select 2+3*n else 2*Self(n-2): n in [1..40] ];
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CROSSREFS
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Equals A094958 (numbers of the form 2^n or 5*2^n) without initial terms 1, 2, 4.
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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