1,1

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

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

F. Harary and E. M. Palmer, Enumeration of finite automata, Inform. Control, 10 (1967), 499-508.

F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 149.

Sequence in context: A119547 A117797 A117312 this_sequence A131312 A055733 A024136

Adjacent sequences: A000588 A000589 A000590 this_sequence A000592 A000593 A000594

nonn

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

Corrected and extended by Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 28 2000