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 A066303 #6 Mar 30 2012 17:37:12 %S A066303 1,0,6,50,1220,42122,2278248,182111666,21094774212,3479970392642, %T A066303 807001730170592,260359119927269882,115887302333840512956, %U A066303 70677462143507496419690,58725460618979611312258632 %N A066303 Number of connected reduced partially ordered sets (posets) with n labeled elements. %H A066303 <a href="/index/Pos#posets">Index entries for sequences related to posets</a> %F A066303 E.g.f. A(x)=B(x/(1+x)) where B(x) is e.g.f. of A001927. %F A066303 E.g.f. A(x)=log(B(x)) where B(x) is e.g.f. of A066302. %K A066303 nonn %O A066303 1,3 %A A066303 _Christian G. Bower_, Dec 12 2001