A219890 Number of directed 3-regular graphs on n nodes.

1, 2, 23, 415, 19041, 1104045, 79818336, 6958257941, 720814138673, 87579097910309

Offset: 4

Author

N. J. A. Sloane, Nov 30 2012

Keywords

• nonn
• more

Links

• Gunnar Brinkmann, Generating regular directed graphs, Discrete Math., 313 (2012), 1-7.

Crossrefs

Column k=3 of A350910.

Cf. A096368, A219889, A219890, A219891, A219892, A219893.