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A021684
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Expansion of 1/((1-x)(1-3x)(1-9x)(1-10x)).
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4
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1, 23, 360, 4810, 59111, 690573, 7801990, 86089520, 933531621, 9989073523, 105774639620, 1110701801430, 11583617458531, 120125571974873, 1239860303429250, 12746044308940540, 130587414625807841
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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) = -1/144 +10^(n+3)/63+3^(n+2)/28 -3*9^(n+2)/16. - R. J. Mathar, Mar 15 2011
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MATHEMATICA
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CoefficientList[Series[1 / ((1 - x) (1 - 3 x) (1 - 9 x) (1 - 10 x)), {x, 0, 20}], x] (* Vincenzo Librandi, Jul 11 2013 *)
LinearRecurrence[{23, -169, 417, -270}, {1, 23, 360, 4810}, 30] (* Harvey P. Dale, Nov 18 2018 *)
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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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