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A105197 Triangle, read by rows, of Stirling numbers of second kind, S2(n,k), multiplied by k^k, for n >= 1, 1<=k<=n. 1
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 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..42.

FORMULA

a(i, j) = stirling2(i, j)*j^j, read by rows.

EXAMPLE

Table begins

1;

1 4;

1 12 27;

1, 28, 162, 256,

etc.

MAPLE

(i, j) -> stirling2(i, j)*j^j

MATHEMATICA

Flatten[Table[Table[k^k StirlingS2[n, k], {k, 1, n}], {n, 1, 9}], 1]

CROSSREFS

Cf. A008277.

Cf. A105196 (similar triangle for S1).

Sequence in context: A117413 A157384 A173621 * A157398 A089503 A019236

Adjacent sequences:  A105194 A105195 A105196 * A105198 A105199 A105200

KEYWORD

nonn,tabl,easy

AUTHOR

Jeffrey Hall (hallj5(AT)southernct.edu), Apr 11 2005

EXTENSIONS

Typo in definition and Mathematica program by Olivier GĂ©rard, Oct 24 2012

STATUS

approved

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Last modified October 30 13:41 EDT 2014. Contains 248803 sequences.