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REFERENCES
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Rosenberg, Ivo; The number of maximal closed classes in the set of functions over a finite domain. J. Combinatorial Theory Ser. A 14 (1973), 1-7.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Zaharova, E. Ju.; Kudrjavcev, V. B.; Jablonskii, S. V. Precomplete classes in $k$-valued logics. (Russian) Dokl. Akad. Nauk SSSR 186 1969 509-512. English translation in Soviet Math. Doklady 10 (No. 3, 1969), 618-622.
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