Search: id:A051240
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%I A051240 M1723
%S A051240 1,1,1,2,6,156,7013320,29281354514767168,
%T A051240 234431745534048922731115555415680,
%U A051240 453456943706240925312368435237969462391555337386758635520
%N A051240 Number of 4-uniform hypergraphs on n unlabeled nodes, or equivalently 
               pure 3-dimensional simplicial complexes on n unlabeled nodes.
%D A051240 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A051240 V. Jovovic, On the number of m-place relations (in Russian), Logiko-algebraicheskie 
               konstruktsii, Tver, 1992, 59-66.
%D A051240 E. M. Palmer, On the number of n-plexes, Discrete Math., 6 (1973), 377-390. 
               [The numbers are incorrect]
%Y A051240 Cf. A000665, A092337.
%Y A051240 Sequence in context: A015173 A122570 A088430 this_sequence A003189 A135937 
               A137532
%Y A051240 Adjacent sequences: A051237 A051238 A051239 this_sequence A051241 A051242 
               A051243
%K A051240 nonn,nice
%O A051240 1,4
%A A051240 Vladeta Jovovic (vladeta(AT)eunet.rs)

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