|
Search: id:A006468
|
|
|
| A006468 |
|
Number of rooted planar maps. (Formerly M3984)
|
|
+0 2
|
|
| 5, 37, 150, 449, 1113, 2422, 4788, 8790, 15213, 25091, 39754, 60879
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
REFERENCES
|
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Walsh, T. R. S.; Lehman, A. B.; Counting rooted maps by genus. III: Nonseparable maps. J. Combinatorial Theory Ser. B 18 (1975), 222-259.
|
|
FORMULA
|
G.f.: (5+2x-4x^2+x^3)/(x-1)^7 (conjectured). - Ralf Stephan, Apr 23 2004
|
|
CROSSREFS
|
Sequence in context: A142036 A089195 A023289 this_sequence A144954 A146195 A095924
Adjacent sequences: A006465 A006466 A006467 this_sequence A006469 A006470 A006471
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com).
|
|
|
Search completed in 0.002 seconds
|