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A219894
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Number of directed 2-regular graphs on n nodes without directed 2-cycles.
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1
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1, 4, 9, 55, 453, 4357, 47598, 569769, 7371560, 102525991, 1525164223
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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5,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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