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A094361
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Pair-reversal of 1,4,4,16,16...
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0
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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; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| 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
| G.f. : (4+x)/(1-4x^2); a(n)=(9*2^n+7(-2)^n)/4.
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CROSSREFS
| Cf. A076736.
Sequence in context: A062780 A175844 A167343 * A187926 A067425 A188481
Adjacent sequences: A094358 A094359 A094360 * A094362 A094363 A094364
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KEYWORD
| easy,nonn
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Apr 26 2004
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