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Search: id:A079638
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| A079638 |
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Matrix product of unsigned Lah-triangle |A008297(n,k)| and unsigned Stirling1-triangle |A008275(n,k)|. |
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+0
1
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| 1, 3, 1, 14, 9, 1, 90, 83, 18, 1, 744, 870, 275, 30, 1, 7560, 10474, 4275, 685, 45, 1, 91440, 143892, 70924, 14805, 1435, 63, 1, 1285200, 2233356, 1274196, 324289, 41160, 2674, 84, 1, 20603520, 38769840, 24870572, 7398972, 1151409, 98280, 4578
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Matrix product of unsigned Lah-triangle |A008297(n,k)| and Stirling1-triangle A008275(n,k) is unsigned Stirling1-triangle |A008275(n,k)|.
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FORMULA
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T(n, k) = Sum_{i=k..n} |A008297(n, i)| * |A008275(i, k)|.
E.g.f.: ((1-x)/(1-2*x))^y. - Vladeta Jovovic (vladeta(AT)eunet.rs), Nov 22 2003
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EXAMPLE
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1; 3,1; 14,9,1; 90,83,18,1; 744,870,275,30,1; 7560,10474,4275,685,45,1; ...
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CROSSREFS
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Cf. A002866 (row sums), A029767 (first column).
Sequence in context: A164807 A122689 A079640 this_sequence A018858 A101820 A055301
Adjacent sequences: A079635 A079636 A079637 this_sequence A079639 A079640 A079641
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KEYWORD
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nonn,tabl
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AUTHOR
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Vladeta Jovovic (vladeta(AT)eunet.rs), Jan 30 2003
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