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 A261994 #12 Mar 14 2020 10:31:53 %S A261994 1,1,1,0,1,2,6,18,71,307,1594,9446,63461 %N A261994 Number of complemented lattices on n nodes. %D A261994 R. Belohlavek, V. Vychodil, Residual lattices of size <=12, Order 27 (2010) 147-161 doi:10.1007/s11083-010-9143-7, Table 6 %o A261994 (Sage) %o A261994 for n in range(7): %o A261994 print(len([L for L in Posets(n) if L.is_lattice() and LatticePoset(L).is_complemented()])) %K A261994 nonn,more %O A261994 0,6 %A A261994 _Jori Mäntysalo_, Sep 08 2015