%I A003425 M4294
%S A003425 1,1,6,114,5256,507720,93616560,30894489360,17407086641280,16152167106391680,
%T A003425 23990233574783750400,55735096448700749203200
%N A003425 n! times number of posets with n elements.
%D A003425 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A003425 K. K.-H. Butler, A Moore-Penrose inverse for Boolean relation matrices, 
               pp. 18-28 of Combinatorial Mathematics (Proceedings 2nd Australian 
               Conf.), Lect. Notes Math. 403, 1974.
%H A003425 <a href="Sindx_Pos.html#posets">Index entries for sequences related to 
               posets</a>
%Y A003425 Cf. A001035.
%Y A003425 Sequence in context: A051228 A059116 A121544 this_sequence A052465 A113015 
               A024275
%Y A003425 Adjacent sequences: A003422 A003423 A003424 this_sequence A003426 A003427 
               A003428
%K A003425 nonn
%O A003425 0,3
%A A003425 N. J. A. Sloane (njas(AT)research.att.com).