This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A066302 #10 Jan 05 2021 21:30:26 %S A066302 1,1,1,7,75,1531,50673,2613703,202180723,22853355895,3701983130913, %T A066302 846741042881779,270316009546766571,119343586350194910211, %U A066302 72325998629777739416209,59798727157327673157936319 %N A066302 Reduced partially ordered sets (posets) with n labeled elements. %D A066302 F. Bergeron, G. Labelle and P. Leroux, Combinatorial Species and Tree-Like Structures, Cambridge, 1998, p. 57 (1.4.70). %H A066302 <a href="/index/Pos#posets">Index entries for sequences related to posets</a> %F A066302 E.g.f.: A(x)=B(x/(1+x)) where B(x) is e.g.f. of A001035. %F A066302 E.g.f.: A(x)=exp(B(x)) where B(x) is e.g.f. of A066303. %K A066302 nonn %O A066302 0,4 %A A066302 _Christian G. Bower_, Dec 12 2001