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A105197
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Triangle, read by rows, of Stirling numbers of second kind, S2(n,k), multiplied by k^k, for n >= 1, 1<=k<=n.
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1
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1, 1, 4, 1, 12, 27, 1, 28, 162, 256, 1, 60, 675, 2560, 3125, 1, 124, 2430, 16640, 46875, 46656, 1, 252, 8127, 89600, 437500, 979776, 823543, 1, 508, 26082, 435456, 3281250, 12410496, 23059204, 16777216, 1, 1020, 81675, 1989120, 21721875, 123451776
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OFFSET
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1,3
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LINKS
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FORMULA
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a(i, j) = stirling2(i, j)*j^j, read by rows.
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EXAMPLE
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Table begins
1;
1 4;
1 12 27;
1, 28, 162, 256,
etc.
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MAPLE
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(i, j) -> stirling2(i, j)*j^j
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MATHEMATICA
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Flatten[Table[Table[k^k StirlingS2[n, k], {k, 1, n}], {n, 1, 9}], 1]
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CROSSREFS
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Cf. A105196 (similar triangle for S1).
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KEYWORD
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AUTHOR
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Jeffrey Hall (hallj5(AT)southernct.edu), Apr 11 2005
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EXTENSIONS
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Typo in definition and Mathematica program by Olivier Gérard, Oct 24 2012
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STATUS
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approved
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