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Search: a066305 -id:a066305
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A066304
Reduced partially ordered sets (posets) with n unlabeled elements.
+10
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
Table of n, a(n) for n=0..6.
Index entries for sequences related to posets
CROSSREFS
Cf. A000112. Euler transform of A066305.
KEYWORD
nonn,more
AUTHOR
Christian G. Bower, Dec 12 2001
STATUS
approved
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Last modified November 30 00:39 EST 2024. Contains 378234 sequences.
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