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 A271078 #20 Feb 26 2020 07:15:34 %S A271078 0,1,1,0,1,1,2,4,9,22,59,181 %N A271078 Number of non-isomorphic atomic lattices on n nodes. %o A271078 (SageMath) %o A271078 for i in range(0, 12): %o A271078 n = 0 %o A271078 for P in Posets(i): %o A271078 if P.is_lattice(): %o A271078 L = LatticePoset(P) %o A271078 if L.is_atomic(): %o A271078 n += 1 %o A271078 print(n) %Y A271078 Cf. A006966. %K A271078 nonn,hard,more %O A271078 0,7 %A A271078 _Jori Mäntysalo_, Mar 30 2016