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A083302
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a(n) = (4*9^n + (-1)^n)/5.
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2
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1, 7, 65, 583, 5249, 47239, 425153, 3826375, 34437377, 309936391, 2789427521, 25104847687, 225943629185, 2033492662663, 18301433963969, 164712905675719, 1482416151081473, 13341745359733255, 120075708237599297
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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-x)/((1-*9x)(1+x)).
E.g.f.: (4*exp(9*x) + exp(-x))/5.
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PROG
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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