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A020564
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Number of cyclic oriented multigraphs on n labeled arcs (without loops).
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0
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1, 1, 7, 88, 1686, 44746, 1550780, 67381560, 3562868722, 224113484498, 16473080538422, 1394549071911392, 134354292707375708, 14583554691197056644, 1768268298908733087440, 237735747822259634293456, 35212913676142942896961116
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OFFSET
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0,3
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REFERENCES
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G. Labelle, Counting enriched multigraphs..., Discrete Math., 217 (2000), 237-248.
G. Paquin, D\'enombrement de multigraphes enrichis, M\'emoire, Math. Dept., Univ. Qu\'ebec \`a Montr\'eal, 2004.
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LINKS
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Table of n, a(n) for n=0..16.
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CROSSREFS
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Sequence in context: A155465 A137143 A069430 * A006291 A220193 A220357
Adjacent sequences: A020561 A020562 A020563 * A020565 A020566 A020567
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KEYWORD
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nonn
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AUTHOR
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Gilbert Labelle (gilbert(AT)lacim.uqam.ca), Simon Plouffe
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STATUS
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approved
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