|
| |
|
|
A103938
|
|
Number of rooted non-separable n-edge maps in the plane (planar with a distinguished outside face).
|
|
1
|
|
|
|
3, 2, 5, 18, 77, 364, 1836, 9690, 52877, 296010, 1690845, 9817080, 57769740, 343806368, 2065802056, 12515350122, 76367432013, 468922828150, 2895381678735, 17966214519330
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
REFERENCES
|
V. A. Liskovets and T. R. Walsh, Enumeration of unrooted maps on the plane, Rapport technique, UQAM, No. 2005-01, Montreal, Canada, 2005.
|
|
|
LINKS
|
Table of n, a(n) for n=1..20.
V. A. Liskovets and T. R. Walsh, Counting unrooted maps on the plane, Advances in Applied Math., 36, No.4 (2006), 364-387.
|
|
|
FORMULA
|
a(n)=(n+2)*A000139(n)/2.
|
|
|
CROSSREFS
|
Sequence in context: A187943 A214502 A077039 * A085973 A005265 A005266
Adjacent sequences: A103935 A103936 A103937 * A103939 A103940 A103941
|
|
|
KEYWORD
|
easy,nonn
|
|
|
AUTHOR
|
Valery A. Liskovets, Mar 17 2005
|
|
|
STATUS
|
approved
|
| |
|
|
