# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a006870 Showing 1-1 of 1 %I A006870 M2755 #18 Nov 08 2017 15:55:14 %S A006870 1,1,3,8,26,94,435,2564,19983,205729 %N A006870 Number of quasi-orders with n elements. %D A006870 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A006870 M. Erné and K. Stege, The number of partially ordered (labeled) sets, Preprint, 1989. (Annotated scanned copy) %H A006870 M. Erné and K. Stege, Counting Finite Posets and Topologies, Order, 8 (1991), 247-265. %K A006870 nonn,nice,more %O A006870 0,3 %A A006870 _N. J. A. Sloane_ # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE