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 A055512 Lattices with n labeled elements. 6
 1, 1, 2, 6, 36, 380, 6390, 157962, 5396888, 243179064, 13938711210, 987858368750, 84613071940452, 8597251494954564, 1020353444641839854, 139627532137612581090, 21788453795572514675760, 3840596246648027262079472, 758435490711709577216754642 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Sean A. Irvine, Table of n, a(n) for n = 0..19 (terms 0..18 from David Wasserman) J. Heitzig and J. Reinhold, Counting finite lattices, preprint no. 298, Institut für Mathematik, Universität Hanover, Germany, 1999. Sean A. Irvine, Java program (github). J. Heitzig and J. Reinhold, Counting finite lattices,  Algebra univers. 48, 43-53 (2002). D. J. Kleitman and K. J. Winston, The asymptotic number of lattices, in: Combinatorial mathematics, optimal designs and their applications (Proc. Sympos. Combin. Math. and Optimal Design, Colorado State Univ., Fort Collins, Colo., 1978), Ann. Discrete Math. 6 (1980), 243-249. Alan Veliz-Cuba and Reinhard Laubenbacher, Dynamics of semilattice networks with strongly connected dependency graph, Automatica (2019) Vol. 99, 167-174. CROSSREFS Cf. A006966, A001035. Main diagonal of A058159. Sequence in context: A196870 A089709 A262234 * A078973 A208650 A152480 Adjacent sequences:  A055509 A055510 A055511 * A055513 A055514 A055515 KEYWORD core,hard,nonn,nice AUTHOR Jobst Heitzig (heitzig(AT)math.uni-hannover.de), Jul 03 2000 STATUS approved

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Last modified June 14 07:10 EDT 2021. Contains 345018 sequences. (Running on oeis4.)