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A016172
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Expansion of 1/((1-6x)(1-9x)).
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1
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1, 15, 171, 1755, 17091, 161595, 1501011, 13789035, 125780931, 1142106075, 10339420851, 93417584715, 842935044771, 7599476096955, 68473649036691, 616733026314795, 5553418346740611, 49997691780110235
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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) = (9^(n+1)-6^(n+1))/3. - Lambert Klasen (lambert.klasen(AT)gmx.net), Feb 05 2005
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MATHEMATICA
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CoefficientList[Series[1/((1-6x)(1-9x)), {x, 0, 30}], x] (* or *) LinearRecurrence[{15, -54}, {1, 15}, 30] (* Harvey P. Dale, Oct 07 2015 *)
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PROG
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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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