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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

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.

LINKS

David Wasserman, Table of n, a(n) for n = 0..18

J. Heitzig and J. Reinhold, Counting finite lattices, preprint no. 298, Institut für Mathematik, Universität Hanover, Germany, 1999.

Index entries for "core" sequences

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 January 22 08:47 EST 2018. Contains 298042 sequences.