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 A128797 (n^2-n)*3^n. 1
 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)
 OFFSET 0,3 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Index to sequences with linear recurrences with constant coefficients, signature (9,-27,27). FORMULA G.f.: 18*x^2/(1-3*x)^3. - Vincenzo Librandi, Feb 10 2013 MATHEMATICA CoefficientList[Series[18 x^2/(1 - 3 x)^3, {x, 0, 30}], x] (* Vincenzo Librandi, Feb 10 2013 *) PROG (MAGMA) [(n^2-n)*3^n: n in [0..25]]; // Vincenzo Librandi, Feb 10 2013 CROSSREFS Cf. A036289, A007758. Sequence in context: A222914 A171642 A158808 * A008418 A099196 A041618 Adjacent sequences:  A128794 A128795 A128796 * A128798 A128799 A128800 KEYWORD nonn,easy AUTHOR Mohammad K. Azarian, Apr 07 2007 STATUS approved

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