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A288836
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a(n) = (1/3!)*3^(n+1)*(n+5)*(n+1)*(n).
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4
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18, 189, 1296, 7290, 36450, 168399, 734832, 3070548, 12400290, 48715425, 187067232, 704690766, 2611501074, 9542023155, 34437376800, 122941435176, 434685788658, 1523724783237, 5299912289520, 18305618105250, 62824881337218, 214364018189079, 727538485975056
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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*3^2*(2-3*z)/(1-3*z)^4.
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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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