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A066302 Reduced partially ordered sets (posets) with n labeled elements. 1


%S 1,1,1,7,75,1531,50673,2613703,202180723,22853355895,3701983130913,

%T 846741042881779,270316009546766571,119343586350194910211,

%U 72325998629777739416209,59798727157327673157936319

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

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

%H <a href="/index/Pos#posets">Index entries for sequences related to posets</a>

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

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

%K nonn

%O 0,4

%A _Christian G. Bower_, Dec 12 2001

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Last modified December 19 05:27 EST 2014. Contains 252177 sequences.