OFFSET
4,4
COMMENTS
Also the number of isomorphism classes of homologically trivial basic nets on RP^2 with n-1 nodes and n faces.
Also the number of isomorphism classes of simple quadrangulations of the sphere of minimum degree 3 with 2n nodes and 2n-2 faces which admit an orientation reversing involution without fix nodes and fix edges such that the bipartite coloring is preserved under the involution.
LINKS
S. Yu. Orevkov, Basic nets in the projective plane
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Stepan Orevkov, Aug 30 2013
STATUS
approved