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A091104
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Expansion of (1-4x+24x^2)/((1-4x)(1+4x)).
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0
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1, -4, 40, -64, 640, -1024, 10240, -16384, 163840, -262144, 2621440, -4194304, 41943040, -67108864, 671088640, -1073741824, 10737418240, -17179869184, 171798691840, -274877906944, 2748779069440, -4398046511104, 43980465111040, -70368744177664
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OFFSET
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0,2
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COMMENTS
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a(0)=1, a(2n-1)=-k^(2n-1), a(2n)=(3k-2)k^(2n-1), k=4; G.f.: (1-kx+2(k-1)kx^2)/((1-kx)(1+kx)), k=4.
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LINKS
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FORMULA
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a(n)=3*4^n/4+7(-4)^n/4-6*0^n/4
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CROSSREFS
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KEYWORD
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easy,sign
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AUTHOR
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STATUS
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approved
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