3,3

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Walsh, T. R. S.; Generating nonisomorphic maps without storing them. SIAM J. Algebraic Discrete Methods 4 (1983), no. 2, 161-178.

Sequence in context: A082279 A113180 A000116 this_sequence A100447 A112278 A059731

Adjacent sequences: A006404 A006405 A006406 this_sequence A006408 A006409 A006410

nonn

N. J. A. Sloane (njas(AT)research.att.com).