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Search: id:A157526
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| A157526 |
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Triangular sequence from coefficients of the polynomial recursion: p(x,n)=Sum[Binomial[n, m]*p[x, m]*p[x, n - m - 1], {m, 0, n - 1}]. |
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1
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| 1, 1, 1, 3, 3, 15, 18, 3, 105, 150, 45, 945, 1575, 675, 45, 10395, 19845, 11025, 1575, 135135, 291060, 198450, 44100, 1575, 2027025, 4864860, 3929310, 1190700, 99225, 34459425, 91216125, 85135050, 32744250, 4465125, 99225, 654729075, 1895268375
(list; table; graph; listen)
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OFFSET
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0,4
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COMMENT
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Row sums are:
{1, 2, 6, 36, 300, 3240, 42840, 670320, 12111120, 248119200, 5683154400,...}.
The first column is A001147:
{1, 1, 3, 15, 105, 945, 10395, 135135, 2027025, 34459425, 654729075,...}.
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FORMULA
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p(x,n)=Sum[Binomial[n, m]*p[x, m]*p[x, n - m - 1], {m, 0, n - 1}].
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EXAMPLE
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{1},
{1, 1},
{3, 3},
{15, 18, 3},
{105, 150, 45},
{945, 1575, 675, 45},
{10395, 19845, 11025, 1575},
{135135, 291060, 198450, 44100, 1575},
{2027025, 4864860, 3929310, 1190700, 99225},
{34459425, 91216125, 85135050, 32744250, 4465125, 99225},
{654729075, 1895268375, 2006754750, 936485550, 180093375, 9823275}
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MATHEMATICA
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p[x, 0] = 1;
p[x, 1] = x + 1;
p[x_, n_] := Sum[Binomial[n, m]*p[x, m]*p[x, n - m - 1], {m, 0, n - 1}];
Table[ExpandAll[p[x, n]], {n, 0, 10}];
Table[CoefficientList[ExpandAll[p[x, n]], x], {n, 0, 10}];
Flatten[%]
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CROSSREFS
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A001147
Sequence in context: A055634 A133221 A110096 this_sequence A153512 A127328 A002891
Adjacent sequences: A157523 A157524 A157525 this_sequence A157527 A157528 A157529
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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), Mar 02 2009
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