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A330016 a(n) = Sum_{k=1..n} (-1)^(n - k) * H(k) * k!, where H(k) is the k-th harmonic number. 0
0, 1, 2, 9, 41, 233, 1531, 11537, 98047, 928529, 9700111, 110843729, 1375599151, 18427159889, 265038487471, 4074124514129, 66660157879471, 1156745432699729, 21220242625821871, 410344904191816529, 8342603132569783471, 177902207647600456529, 3970574571687854263471 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..22.

FORMULA

a(n) = Sum_{k=1..n} (-1)^(n - k) * |Stirling1(k+1,2)|.

MATHEMATICA

Table[Sum[(-1)^(n - k) HarmonicNumber[k] k!, {k, 1, n}], {n, 0, 22}]

CROSSREFS

Cf. A000254, A001008, A002805, A092692, A097422.

Sequence in context: A152052 A192661 A020038 * A056845 A162273 A289684

Adjacent sequences:  A330013 A330014 A330015 * A330017 A330018 A330019

KEYWORD

nonn

AUTHOR

Ilya Gutkovskiy, Nov 27 2019

STATUS

approved

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Last modified May 20 23:05 EDT 2022. Contains 353886 sequences. (Running on oeis4.)