A066304 Reduced partially ordered sets (posets) with n unlabeled elements.

1, 1, 1, 3, 8, 30, 150

Offset: 0

Author

Christian G. Bower, Dec 12 2001

Keywords

• nonn
• more

References

• F. Bergeron, G. Labelle and P. Leroux, Combinatorial Species and Tree-Like Structures, Cambridge, 1998, p. 57 (1.4.70).

Links

• Index entries for sequences related to posets

Crossrefs

Cf. A000112. Euler transform of A066305.