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A022017 Number of connected partially ordered sets with n "lines": pairs (a,b) where a < b and there is no c with a < c < b. The lines form the minimal basis for the partial ordering. 2
1, 3, 8, 29, 103 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The points are unlabeled.

REFERENCES

See A000112 for references and links about partially ordered sets.

LINKS

Table of n, a(n) for n=1..5.

N. J. A. Sloane, Illustration of initial terms of A022016 and A022017.

EXAMPLE

See Sloane's link.

CROSSREFS

Cf. A000112, A000608, A022016.

Sequence in context: A148872 A148873 A148874 * A148875 A148876 A245889

Adjacent sequences:  A022014 A022015 A022016 * A022018 A022019 A022020

KEYWORD

nonn,more

AUTHOR

Franklin T. Adams-Watters, Mar 30 2002

STATUS

approved

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Last modified August 24 03:51 EDT 2019. Contains 326260 sequences. (Running on oeis4.)