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How many graph isomorphic classes are there given n vertices?

  1. Jun 11, 2009 #1
    I'm talking about undirected simple graphs.
  2. jcsd
  3. Jun 12, 2009 #2


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    I believe this is
    http://www.research.att.com/~njas/sequences/A000088 [Broken]
    Last edited by a moderator: May 4, 2017
  4. Jun 12, 2009 #3
    Thanks. I'd like to see how those formulas were obtained, though.
  5. Jun 12, 2009 #4
    Brute force??
  6. Jun 12, 2009 #5
    The formula is at the bottom of the link above.
  7. Jun 12, 2009 #6
    Yes but how do you derive said formula?
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