2,2

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.

Adjacent sequences: A006384 A006385 A006386 this_sequence A006388 A006389 A006390

Sequence in context: A081337 A138240 A083805 this_sequence A014481 A000683 A143342

nonn

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