3,1

Tutte, W. T.; On the enumeration of planar maps. Bull. Amer. Math. Soc. 74 1968 64-74.

T. R. S. Walsh, Combinatorial Enumeration of Non-Planar Maps. Ph.D. Dissertation, Univ. of Toronto, 1971.

T. R. S. Walsh and A. B. Lehman, Counting rooted maps by genus, J. Comb. Thy B13 (1972), 122-141 and 192-218.

Sequence in context: A064747 A054688 A112650 this_sequence A006297 A099711 A120977

Adjacent sequences: A006292 A006293 A006294 this_sequence A006296 A006297 A006298

nonn

njas