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A016147
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Expansion of 1/((1-3x)(1-12x)).
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1
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1, 15, 189, 2295, 27621, 331695, 3981069, 47775015, 573306741, 6879700575, 82556465949, 990677768535, 11888133753861, 142657606640655, 1711891284470829, 20542695427998855, 246512345179032981, 2958148142277535935, 35497777707717851709, 425973332493776481975
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = (4*12^n - 3^n)/3. - Zak Seidov, Mar 14 2011
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MATHEMATICA
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LinearRecurrence[{15, -36}, {1, 15}, 20] (* Harvey P. Dale, Apr 30 2013 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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