|
|
A084284
|
|
Number of connected labeled 4-colorable (i.e., chromatic number <= 4) graphs on n nodes.
|
|
3
|
|
|
1, 1, 4, 38, 727, 26538, 1832900, 241187797, 60807843592, 29307734588670, 26725594885115575
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,3
|
|
LINKS
|
|
|
FORMULA
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,more
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|