Number of n-vertex unlabeled oriented graphs without endpoints.

A101389

Number of n-vertex unlabeled oriented graphs without endpoints.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =21a(5) =369a(6) =16929a(7) =1913682a(8) =546626268a(9) =406959998851

External references