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Search: id:A094361
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| A094361 |
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Pair-reversal of 1,4,4,16,16... |
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+0
1
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| 4, 1, 16, 4, 64, 16, 256, 64, 1024, 256, 4096, 1024, 16384, 4096, 65536, 16384, 262144, 65536, 1048576, 262144, 4194304, 1048576, 16777216, 4194304, 67108864, 16777216, 268435456, 67108864, 1073741824, 268435456, 4294967296, 1073741824
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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a(n)=k^(n/2)(1+k*sqrt(k)-(1-ksqrt(k))(-1)^n)/(2*sqrt(k)), the pair reversal of 1,k,k,k^2,k^2,k^3,k^3,... for k=4.
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FORMULA
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G.f. : (4+x)/(1-4x^2); a(n)=(9*2^n+7(-2)^n)/4.
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CROSSREFS
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Cf. A076736.
Sequence in context: A117292 A062780 A167343 this_sequence A067425 A138681 A038231
Adjacent sequences: A094358 A094359 A094360 this_sequence A094362 A094363 A094364
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Apr 26 2004
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