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A022016 Partially ordered sets with no isolated points by number of "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. +0
2
1, 1, 4, 12, 47, 174 (list; graph; listen)
OFFSET

0,3

CROSSREFS

Cf. A000112, A022017.

Sequence in context: A101225 A000775 A035310 this_sequence A032380 A057346 A081620

Adjacent sequences: A022013 A022014 A022015 this_sequence A022017 A022018 A022019

KEYWORD

nonn

AUTHOR

Frank Adams-Watters (FrankTAW(AT)Netscape.net), Mar 30 2002

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Last modified August 7 15:46 EDT 2008. Contains 142650 sequences.


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