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14, 490, 10290, 163268, 2184910, 26118078, 288240050, 2997696520, 29780961966, 285300001490, 2653572489106, 24083839729740, 214124712999470, 1870539234917542, 16094233518706770, 136653810502199312
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 1..1000
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FORMULA
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G.f.: 14*x*(1 + 7*x + 49*x^2)/(1 - 7*x)^4. - Vincenzo Librandi, Feb 22 2013
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MATHEMATICA
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Table[(n^3 + n) * 7^n, {n, 30}] (* or *) CoefficientList[Series[14 (1 + 7 x + 49 x^2)/(1 - 7 x)^4, {x, 0, 20}], x] (* Vincenzo Librandi, Feb 22 2013 *)
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PROG
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(MAGMA) [(n^3 + n)*7^n: n in [1..20]]; // Vincenzo Librandi, Feb 22 2013
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CROSSREFS
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Cf. A128796, A128960, A128985, A129002.
Sequence in context: A208563 A200061 A171208 * A217337 A024299 A190999
Adjacent sequences: A128048 A128049 A128050 * A128052 A128053 A128054
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KEYWORD
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nonn,easy
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AUTHOR
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Mohammad K. Azarian, May 02 2007
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STATUS
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approved
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