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A308444
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a(0) = 1; a(n) = Sum_{k=1..n} Stirling2(n,k)*a(n-k).
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2
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1, 1, 2, 6, 27, 178, 1701, 23444, 464207, 13175526, 535353033, 31114680549, 2585577239479, 307143443783879, 52156058585285410, 12661558539485464967, 4394996515200407462730, 2181761307828685811029286, 1549298114199282873678255787, 1574165879361329032738370945407
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OFFSET
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0,3
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LINKS
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FORMULA
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MATHEMATICA
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a[n_] := a[n] = Sum[StirlingS2[n, k] a[n - k], {k, 1, n}]; a[0] = 1; Table[a[n], {n, 0, 19}]
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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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