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A069471
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Stirling transform of squares of Bell numbers: a(0)=1, a(n) = Sum_{k=1..n} Stirling2(n,k)*(bell(k))^2.
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1
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1, 1, 5, 38, 404, 5640, 98769, 2099606, 52883390, 1549218221, 52014755913, 1977659061064, 84305075757125, 3995485979209678, 209005906088572893, 11992147240091361387, 750583356339067110013, 50998365413706734478011
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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Join[{1}, Table[Sum[StirlingS2[n, k]*BellB[k]^2, {k, 1, n}], {n, 1, 50}]] (* G. C. Greubel, May 23 2018 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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