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A081682
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a(n) = (9^n-8^n-7^n-6^n+4*5^n)/2.
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1
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1, 4, 16, 79, 634, 7099, 83746, 947419, 10193794, 105291979, 1054581826, 10323156859, 99334276354, 943521561259, 8873286384706, 82805541911899, 768050761613314, 7089438235180939, 65182761011000386, 597402284308532539
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refs;
listen;
history;
text;
internal format)
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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.: -(3603*x^4-1866*x^3+361*x^2-31*x+1)/((5*x-1)*(6*x-1)*(7*x-1)*(8*x-1)*(9*x-1)). [Colin Barker, Sep 07 2012]
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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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