[seqfan] Description of A007297 incorrect
Axel Boldt
axelboldt at yahoo.com
Thu Nov 5 02:11:52 CET 2015
The description of A007297 says
"Number of connected graphs on n nodes on a
circle without crossing edges."
It's not clear what difference it makes that
the nodes lie on a circle.
I think we want instead
"Number of connected graphs on n labeled nodes
on a circle with straight-line edges that don't
cross."
But even then we'd get the sequence (starting
with n=1): 1,1,4,23,156,..., so the initial 1
is missing.
I'm not sure how to fix it; maybe have two
separate entries, one for the g.f. series
reversion of A162395 and the other for the above
graph counting sequence?
Axel
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