Search: id:A091073
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%I A091073
%S A091073 1,2,8,39,242,1895,19051,246895,4145108,90325655,2555630036,93810648902,
%T A091073 4461086120602,274339212258846,21775814889230580,2226876304576948549
%N A091073 Number of transitive relations on n unlabeled points.
%C A091073 [ a(13)-a(15) are from Brinkmann's and McKay's paper ] - Vladeta Jovovic 
               (vladeta(AT)eunet.rs), Jan 07 2006
%D A091073 Gunnar Brinkmann and Brendan D. McKay, Counting Unlabeled Topologies 
               and Transitive Relations, Journal of Integer Sequences, Vol. 8 (2005), 
               Article 05.2.1.
%H A091073 Gunnar Brinkmann and Brendan D. McKay, <a href="http://cs.anu.edu.au/
               ~bdm/papers/topologies.pdf">Counting unlabeled topologies and transitive 
               relations</a>.
%H A091073 G. Pfeiffer, <a href="http://schmidt.nuigalway.ie/~goetz/pub/posetseq.html">
               Counting Transitive Relations</a>, preprint, 2004.
%H A091073 G. Pfeiffer, <a href="http://www.cs.uwaterloo.ca/journals/JIS/">Counting 
               Transitive Relations</a>, Journal of Integer Sequences, Vol. 7 (2004), 
               Article 04.3.2.
%Y A091073 Cf. A079265 (antisymmetric transitive relations), A001930 (reflexive 
               transitive relations), A000112 (partial orders), A006905 (labeled 
               transitive relations).
%Y A091073 Sequence in context: A059275 A020047 A068107 this_sequence A154132 A152458 
               A087971
%Y A091073 Adjacent sequences: A091070 A091071 A091072 this_sequence A091074 A091075 
               A091076
%K A091073 hard,nonn,nice
%O A091073 0,2
%A A091073 Goetz Pfeiffer (goetz.pfeiffer(AT)nuigalway.ie), Jan 21 2004
%E A091073 More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Jan 07 2006

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