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Search: id:A155868
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| A155868 |
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A sequence of polynomial coefficients related to the first Stirling numbers: p(x,n)=If[n == 0, 1, 1 + x^n + Sum[(-1)^(n - 2*m)* StirlingS1[n, m]*StirlingS1[n, n - m]*x^m, {m, 0, n}]]. |
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| 1, 1, 1, 1, 1, 1, 1, 6, 6, 1, 1, 36, 121, 36, 1, 1, 240, 1750, 1750, 240, 1, 1, 1800, 23290, 50625, 23290, 1800, 1, 1, 15120, 308700, 1193640, 1193640, 308700, 15120, 1, 1, 141120, 4207896, 25738720, 45819361, 25738720, 4207896, 141120, 1, 1, 1451520
(list; table; graph; listen)
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OFFSET
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0,8
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COMMENT
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Row sums are:
{1, 2, 3, 14, 195, 3982, 100807, 3034922, 105994835, 4215106730, 188097696347,...}
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FORMULA
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p(x,n)=If[n == 0, 1, 1 + x^n + Sum[(-1)^(n - 2*m)* StirlingS1[n, m]*StirlingS1[n, n - m]*x^m, {m, 0, n}]]
t(n,m)=coefficients(p(x,n))
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EXAMPLE
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{1},
{1, 1},
{1, 1, 1},
{1, 6, 6, 1},
{1, 36, 121, 36, 1},
{1, 240, 1750, 1750, 240, 1},
{1, 1800, 23290, 50625, 23290, 1800, 1},
{1, 15120, 308700, 1193640, 1193640, 308700, 15120, 1},
{1, 141120, 4207896, 25738720, 45819361, 25738720, 4207896, 141120, 1},
{1, 1451520, 59832864, 535810464, 1510458516, 1510458516, 535810464, 59832864, 1451520, 1},
{1, 16329600, 893121120, 11082015000, 45789404640, 72535955625, 45789404640, 11082015000, 893121120, 16329600, 1}
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MATHEMATICA
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Clear[p, n, m, x, a];
p[x_, n_] = If[n == 0, 1, 1 + x^n + Sum[(-1)^(n - 2*m)* StirlingS1[n, m]*StirlingS1[n, n - m]*x^m, {m, 0, n}]];
Table[ExpandAll[p[x, n]], {n, 0, 10}];
a = Table[CoefficientList[ExpandAll[p[x, n]], x], {n, 0, 10}];
Flatten[a]
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CROSSREFS
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Sequence in context: A046619 A021606 A046606 this_sequence A065493 A133890 A111719
Adjacent sequences: A155865 A155866 A155867 this_sequence A155869 A155870 A155871
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KEYWORD
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nonn,tabl,uned
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jan 29 2009
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