|
Search: id:A006428
|
|
|
| A006428 |
|
Tree-rooted planar maps.
(Formerly M3139)
|
|
+0
1
|
|
| 0, 3, 36, 135, 360, 798, 1568, 2826, 4770, 7645, 11748, 17433
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
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
|
a(n) seems to be divisible by n+1. - Ralf Stephan (ralf(AT)ark.in-berlin.de), Sep 01 2003
|
|
CROSSREFS
|
Sequence in context: A140958 A156189 A158077 this_sequence A068619 A073992 A127960
Adjacent sequences: A006425 A006426 A006427 this_sequence A006429 A006430 A006431
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com).
|
|
|
Search completed in 0.003 seconds
|
