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A066304 Reduced partially ordered sets (posets) with n unlabeled elements. 1
1, 1, 1, 3, 8, 30, 150 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
REFERENCES
F. Bergeron, G. Labelle and P. Leroux, Combinatorial Species and Tree-Like Structures, Cambridge, 1998, p. 57 (1.4.70).
LINKS
CROSSREFS
Cf. A000112. Euler transform of A066305.
Sequence in context: A261766 A078619 A274934 * A298456 A145776 A066165
KEYWORD
nonn,more
AUTHOR
Christian G. Bower, Dec 12 2001
STATUS
approved

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Last modified February 23 09:02 EST 2024. Contains 370276 sequences. (Running on oeis4.)