OFFSET
4,1
LINKS
T. D. Noe, Table of n, a(n) for n=4..30 (from Mednykh and Nedela)
A. D. Mednykh and R. Nedela, Enumeration of unrooted maps with given genus, preprint (submitted to J. Combin. Th. B).
Timothy R. S. Walsh, Alain Giorgetti, Alexander Mednykh, Enumeration of unrooted orientable maps of arbitrary genus by number of edges and vertices, Discrete Math. 312 (2012), no. 17, 2660--2671. MR2935417. - From N. J. A. Sloane, Aug 01 2012
CROSSREFS
KEYWORD
nonn
AUTHOR
Valery A. Liskovets, Mar 22 2005
STATUS
approved