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A058800 Vertically indecomposable lattices on n unlabeled nodes. 2
1, 1, 1, 0, 1, 2, 7, 27, 126, 664, 3954, 26190, 190754, 1514332, 12998035, 119803771, 1178740932, 12316480222, 136060611189, 1582930919092, 19328253734491 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

REFERENCES

J. Heitzig and J. Reinhold, Counting finite lattices, Algebra Universalis, 48 (2002), 43-53.

LINKS

Table of n, a(n) for n=0..20.

V. Gebhardt and S. Tawn, Constructing unlabelled lattices, arXiv:1609.08255 [math.CO], 2016.

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

N. J. A. Sloane, Transforms

CROSSREFS

a(n+1) is Inverse INVERT transform of A006966(n+1).

Sequence in context: A060017 A211475 A213226 * A293031 A255487 A077622

Adjacent sequences:  A058797 A058798 A058799 * A058801 A058802 A058803

KEYWORD

nonn,hard

AUTHOR

Christian G. Bower, Dec 28 2000

EXTENSIONS

a(19) (computed by Jipsen and Lawless) and a(20) from Volker Gebhardt, Sep 28 2016

STATUS

approved

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Last modified October 22 10:20 EDT 2019. Contains 328317 sequences. (Running on oeis4.)