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A137717
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Hankel transform of A106191.
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3
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1, -4, 4, 8, -32, 32, 64, -256, 256, 512, -2048, 2048, 4096, -16384, 16384, 32768, -131072, 131072, 262144, -1048576, 1048576, 2097152, -8388608, 8388608, 16777216, -67108864, 67108864, 134217728, -536870912, 536870912
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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G.f.: (1-2x)/(1+2x+4x^2).
a(n)=Product{k=0..n, (3*cos(2*pi*(k-1)/3)/2-5/4-2*0^k)^(n-k)};
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MATHEMATICA
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LinearRecurrence[{-2, -4}, {1, -4}, 30] (* Harvey P. Dale, Oct 05 2017 *)
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CROSSREFS
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Apart from signs, essentially the same as A096252.
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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