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A147536
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a(n) = 4*3^n+4^n.
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0
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5, 16, 52, 172, 580, 1996, 7012, 25132, 91780, 340876, 1284772, 4902892, 18902980, 73486156, 287567332, 1131137452, 4467154180, 17696429836, 70269158692, 279526952812, 1113458765380
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n)=7*a(n-1)-12*a(n-2) = 4*3^n+4^n. G.f.: (5-19x)/((1-4x)(1-3x)). [From R. J. Mathar, Nov 09 2008]
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CROSSREFS
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KEYWORD
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nonn,easy,less
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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