%I A108799
%S A108799 1,2,5,19,184,14664,108295801
%N A108799 Number of nonisomorphic systems enumerated by A102896; that is, the number 
               of inequivalent closure operators (or Moore families).
%D A108799 D. E. Knuth, The Art of Computer Programming, Vol. 4, Section 7.1.1 (in 
               preparation).
%Y A108799 Equals (1/2)*A108801(n).
%Y A108799 Cf. A102894, A102895, A102896, A102897, A108798, A108800, A108801.
%Y A108799 Sequence in context: A002786 A039719 A014466 this_sequence A085871 A080280 
               A055813
%Y A108799 Adjacent sequences: A108796 A108797 A108798 this_sequence A108800 A108801 
               A108802
%K A108799 nonn,hard
%O A108799 0,2
%A A108799 D. E. Knuth, Jul 01, 2005; a(6) received Aug 17, 2005