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⇱ A007110 - OEIS

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A007110
Number of connected labeled 2-regular oriented graphs with n nodes.
1
0, 0, 0, 0, 0, 24, 570, 27900, 1827630, 152031600, 15453811800, 1884214710000, 271711218933000, 45788138466285600, 8922341314806519600, 1991726163596104135200, 505133470313552174094000
OFFSET
0,6
REFERENCES
R. W. Robinson, personal communication.
R. W. Robinson, Numerical implementation of graph counting algorithms, AGRC Grant, Math. Dept., Univ. Newcastle, Australia, 1982.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
CROSSREFS
Sequence in context: A170743 A218726 A203487 * A007109 A387372 A158538
KEYWORD
nonn,nice
STATUS
approved