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A083426
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a(n) = (4*7^n+2^n)/5.
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0
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1, 6, 40, 276, 1924, 13452, 94132, 658860, 4611892, 32282988, 225980404, 1581861804, 11073030580, 77511209964, 542578461556, 3798049214508, 26586344468788, 186104411215980, 1302730878380788, 9119116148403372
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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.: (1-3*x)/((1-2*x)*(1-7*x)).
E.g.f.: (4*exp(7*x)+exp(2*x))/5.
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MATHEMATICA
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LinearRecurrence[{9, -14}, {1, 6}, 20] (* Harvey P. Dale, Oct 13 2015 *)
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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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