%I A002857 M3078 N1249
%S A002857 1,3,20,996,9333312,6406603084568576,
%T A002857 16879085743296493582043922521915392,
%U A002857 717956902513121252476003434439730211917452457474409186632352788205535232
%N A002857 Number of Post functions of n variables.
%D A002857 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A002857 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002857 Wheeler, Roger F.; Complete propositional connectives. Z. Math. Logik 
               Grundlagen Math. 7 1961 185-198.
%Y A002857 Sequence in context: A089943 A108699 A162134 this_sequence A024011 A052445 
               A089999
%Y A002857 Adjacent sequences: A002854 A002855 A002856 this_sequence A002858 A002859 
               A002860
%K A002857 nonn
%O A002857 1,2
%A A002857 N. J. A. Sloane (njas(AT)research.att.com).
%E A002857 More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 23 2000