OFFSET
0,5
LINKS
Keith M. Briggs, Combinatorial Graph Theory
EXAMPLE
Array giving number of connected graphs on n nodes with chromatic number k begins:
n=...1...2...3...4....5....6.....7......8........9........10
k.------------------------------------------------------------
2|...0...1...1...3....5...17....44....182......730......4032
3|...0...0...1...2...12...64...475...5036....80947...2010328
4|...0...0...0...1....3...26...282...5009...149551...7694428
5|...0...0...0...0....1....4....46....809....27794...1890221
6|...0...0...0...0....0....1.....5.....74.....1940....113272
7|...0...0...0...0....0....0.....1......6......110......4125
8|...0...0...0...0....0....0.....0......1........7.......156
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Feb 16 2007
STATUS
approved