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A005641
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Number of 2-diregular digraphs with n nodes.
(Formerly M2757)
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0
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1, 3, 8, 27, 131, 711, 5055, 41607, 389759, 4065605, 46612528, 581713045, 7846380548, 113718755478, 1762208816647, 29073392136390, 508777045979418
(list;
graph;
refs;
listen;
history;
text;
internal format)
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