1,3

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: A038375 A103043 A018601 this_sequence A018650 A018702 A018719

Adjacent sequences: A006391 A006392 A006393 this_sequence A006395 A006396 A006397

nonn,more

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

Needs a better description!