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A032183
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"CIJ" (necklace, indistinct, labeled) transform of 3,3,3,3...
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3
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3, 12, 84, 876, 12180, 211692, 4415124, 107430636, 2987482260, 93461994732, 3248794543764, 124223034396396, 5181679901192340, 234153759187726572, 11395053576644512404, 594148263021558162156
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OFFSET
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1,1
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LINKS
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FORMULA
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E.g.f.: -log(4-3*exp(x)).
a(n) = Sum_{k=1..n) 3^k*(k-1)!*Stirling2(n, k). (End)
a(n) = 3 * (1 + Sum_{k=1..n-1} binomial(n-1,k-1) * a(k)). - Ilya Gutkovskiy, Aug 09 2020
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MATHEMATICA
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PROG
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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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