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A288835
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a(n) = (1/2!)*3^n*(n+3)*(n).
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3
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6, 45, 243, 1134, 4860, 19683, 76545, 288684, 1062882, 3838185, 13640319, 47829690, 165809592, 569173311, 1937102445, 6543101592, 21953827710, 73222472421, 242912646603, 801960412230, 2636009007156, 8629791392475, 28148810469273, 91507169819844
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OFFSET
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1,1
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LINKS
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FORMULA
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O.g.f.: z*3^1*(2-3*z)/(1-3*z)^3.
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MATHEMATICA
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LinearRecurrence[{9, -27, 27}, {6, 45, 243}, 30] (* Harvey P. Dale, Apr 04 2020 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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