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A141005
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E.g.f. exp(sum_{d|M} (exp(d*x)-1)/d), M=8.
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2
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1, 4, 31, 329, 4316, 66543, 1172077, 23139068, 504673027, 12023659317, 310112290044, 8596075462411, 254551364575929, 8012189624924740, 266901629110149847, 9374566215360038977, 346044223246303101068
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listen;
history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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u[0, j_]: = 1; u[k_, j_]: = u[k, j] = Sum[Binomial[k-1, i-1]Plus@@(u[k-i, j]#^(i-1)&/@Divisors[j]), {i, k}]; Table[u[n, 8], {n, 0, 30}] (* Vincenzo Librandi, Dec 12 2012 *)
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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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