Clawfree graphs erratum... A022562

[Gordon Royle]

A022562 gives the numbers of clawfree graphs, but I disagree with the
last entry...

I think it should be 1728404 rather than 1728403...

Brendan McKay has independently confirmed this observation; if anyone
else is willing and able to check this, then please confirm that 

http://www.csse.uwa.edu.au/~gordon/cf.zip

contains 1728404 distinct 12-vertex connected clawfree graphs. They are
stored in g6 format, which is described 

http://www.csse.uwa.edu.au/~gordon/g6.html

and a reading program given.

The next number in the sequence (13-vertex connected clawfree graphs)
is  23805256.

NB Is the online form the appropriate mechanism for *extending*
sequences? Is the original author of a sequence permitted to check an
extension to their sequence before it is accepted?


-- 
Dr. Gordon F Royle, http://www.csse.uwa.edu.au/~gordon,
gordon at csse.uwa.edu.au
--