%I A001828 M3971 N1641
%S A001828 1,5,33,287,3309,50975,1058493
%N A001828 Related to partially ordered sets.
%D A001828 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A001828 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A001828 D. A. Klarner, The number of graded partially ordered sets, J. Combin. 
               Theory, 6 (1969), 12-19.
%H A001828 <a href="Sindx_Pos.html#posets">Index entries for sequences related to 
               posets</a>
%Y A001828 Sequence in context: A129890 A120733 A144792 this_sequence A084845 A098460 
               A087618
%Y A001828 Adjacent sequences: A001825 A001826 A001827 this_sequence A001829 A001830 
               A001831
%K A001828 nonn
%O A001828 0,2
%A A001828 N. J. A. Sloane (njas(AT)research.att.com).