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A081081
Number of labeled, connected ortho-projection graphs on n vertices.
2
2, 0, 2, 6, 22, 330, 3194, 65142, 1502134
OFFSET
1,1
REFERENCES
B. Shtylla and L. Zulli, Ortho-projection graphs, in preparation.
CROSSREFS
Sequence in context: A161803 A057980 A242840 * A111111 A185343 A161014
KEYWORD
hard,more,nonn
AUTHOR
B. Shtylla and L. Zulli (shtyllab(AT)lafayette.edu, zullil(AT)lafayette.edu), Mar 05 2003
EXTENSIONS
a(9) from Louis Zulli (zullil(AT)lafayette.edu), Aug 23 2004
STATUS
approved