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A007105
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Number of labeled Eulerian 3-regular digraphs with n nodes.
(Formerly M5285)
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3
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1, 0, 0, 0, 1, 44, 7570, 1975560, 749649145, 399035751464, 289021136349036, 277435664056527360, 345023964977303838105, 545099236551025860229460, 1075595203804151695555622446
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OFFSET
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0,6
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COMMENTS
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Apparently this counts the binary variant (all elements in {0,1}) of A001500 with zero trace. - R. J. Mathar, May 16 2021
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REFERENCES
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R. W. Robinson, personal communication.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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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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