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A055512
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Lattices with n labeled elements.
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6
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1, 1, 2, 6, 36, 380, 6390, 157962, 5396888, 243179064, 13938711210, 987858368750, 84613071940452, 8597251494954564, 1020353444641839854, 139627532137612581090, 21788453795572514675760, 3840596246648027262079472, 758435490711709577216754642
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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REFERENCES
| 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.
J. Heitzig and J. Reinhold, Counting finite lattices, Algebra Universalis, 48 (2002), 43-53.
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LINKS
| David Wasserman, Table of n, a(n) for n = 0..18
J. Heitzig and J. Reinhold, Counting finite lattices, preprint no. 298, Institut fuer Mathematik, Universitaet Hanover, Germany, 1999.
Index entries for "core" sequences
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CROSSREFS
| Cf. A006966, A001035. Main diagonal of A058159.
Sequence in context: A133892 A196870 A089709 * A078973 A152480 A001660
Adjacent sequences: A055509 A055510 A055511 * A055513 A055514 A055515
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KEYWORD
| core,hard,nonn
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AUTHOR
| Jobst Heitzig (heitzig(AT)math.uni-hannover.de), Jul 03 2000
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