A081081 Number of labeled, connected ortho-projection graphs on n vertices.

2, 0, 2, 6, 22, 330, 3194, 65142, 1502134

Offset: 1

Author

B. Shtylla and L. Zulli (shtyllab(AT)lafayette.edu, zullil(AT)lafayette.edu), Mar 05 2003

Keywords

• hard
• more
• nonn

References

• B. Shtylla and L. Zulli, Ortho-projection graphs, in preparation.

Links

• L. Zulli, Home Page

Crossrefs

Cf. A081080, A081082.

Extensions

a(9) from Louis Zulli (zullil(AT)lafayette.edu), Aug 23 2004