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0, 0, 18, 162, 972, 4860, 21870, 91854, 367416, 1417176, 5314410, 19486170, 70150212, 248714388, 870500358, 3013270470, 10331213040, 35126124336, 118550669634, 397493421714, 1324978072380, 4393348345260, 14498049539358
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index to sequences with linear recurrences with constant coefficients, signature (9,-27,27).
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FORMULA
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G.f.: 18*x^2/(1-3*x)^3. - Vincenzo Librandi, Feb 10 2013
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MATHEMATICA
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CoefficientList[Series[18 x^2/(1 - 3 x)^3, {x, 0, 30}], x] (* Vincenzo Librandi, Feb 10 2013 *)
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PROG
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(MAGMA) [(n^2-n)*3^n: n in [0..25]]; // Vincenzo Librandi, Feb 10 2013
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CROSSREFS
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Cf. A036289, A007758.
Sequence in context: A222914 A171642 A158808 * A008418 A099196 A041618
Adjacent sequences: A128794 A128795 A128796 * A128798 A128799 A128800
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KEYWORD
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nonn,easy
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AUTHOR
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Mohammad K. Azarian, Apr 07 2007
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STATUS
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approved
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