A066302 - OEIS

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

(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..15.

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.

CROSSREFS

Sequence in context: A127190 A121316 A220215 * A106162 A285454 A139472

Adjacent sequences: A066299 A066300 A066301 * A066303 A066304 A066305

KEYWORD

nonn

AUTHOR

Christian G. Bower, Dec 12 2001

STATUS

approved