login
A007105
Number of labeled Eulerian 3-regular digraphs with n nodes.
(Formerly M5285)
3
1, 0, 0, 0, 1, 44, 7570, 1975560, 749649145, 399035751464, 289021136349036, 277435664056527360, 345023964977303838105, 545099236551025860229460, 1075595203804151695555622446
OFFSET
0,6
COMMENTS
Apparently this counts the binary variant (all elements in {0,1}) of A001500 with zero trace. - R. J. Mathar, May 16 2021
REFERENCES
R. W. Robinson, personal communication.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
Óscar González, Carlos Beltrán, and Ignacio Santamaría, On the Number of Interference Alignment Solutions for the K-User MIMO Channel with Constant Coefficients, arXiv preprint arXiv:1301.6196 [cs.IT], 2013-2014. - From N. J. A. Sloane, Feb 19 2013
CROSSREFS
Sequence in context: A203974 A266853 A323315 * A180842 A172753 A268425
KEYWORD
nonn
AUTHOR
STATUS
approved