Number of connected labeled 4-colorable (i.e., chromatic number <= 4) graphs on n nodes.

A084284

Number of connected labeled 4-colorable (i.e., chromatic number <= 4) graphs on n nodes.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =38a(4) =727a(5) =26538a(6) =1832900a(7) =241187797a(8) =60807843592

External references