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A005641
Number of 2-diregular digraphs with n nodes.
(Formerly M2757)
+0
1
1, 3, 8, 27, 131, 711, 5055, 41607, 389759, 4065605, 46612528, 581713045, 7846380548, 113718755478, 1762208816647, 29073392136390, 508777045979418
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Maintained by
N. J. A. Sloane
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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.
AT&T Labs Research
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