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A020560
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Number of ordered oriented multigraphs on n labeled arcs (without loops).
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0
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1, 1, 8, 110, 2262, 63822, 2335856, 106643980, 5901564892, 387251339836, 29612207398688, 2601877956513640, 259646660158526856, 29140784853464966632, 3647614440065070983488, 505553321559685235600720, 77096697572750991426551056, 12864789849511242132008021520
(list;
graph;
refs;
listen;
history;
text;
internal format)
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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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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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