A066302 Reduced partially ordered sets (posets) with n labeled elements.

1, 1, 1, 7, 75, 1531, 50673, 2613703, 202180723, 22853355895, 3701983130913, 846741042881779, 270316009546766571, 119343586350194910211, 72325998629777739416209, 59798727157327673157936319

Offset: 0

Author

Christian G. Bower, Dec 12 2001

Keywords

• nonn

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

Formula

E.g.f.: A(x)=B(x/(1+x)) where B(x) is e.g.f. of A001035.

E.g.f.: A(x)=exp(B(x)) where B(x) is e.g.f. of A066303.