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 A030268 #16 Mar 17 2020 19:31:17
%S A030268 1,1,1,3,9,35,153,791,4597,29988,215804,1697291,14457059,132392971,
%T A030268 1295346365,13468653637,148142236784,1716782858995,20889118889021
%N A030268 Number of nonisomorphic connected partial lattices.
%C A030268 A partial lattice is a poset where every pair of points has a unique least upper (greatest lower) bound or has no upper (lower) bound.
%H A030268 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a>
%F A030268 Inverse Euler transform of A006966(n-2) (lattices).
%t A030268 A006966 = Cases[Import["https://oeis.org/A006966/b006966.txt", "Table"], {_, _}][[All, 2]];
%t A030268 (* EulerInvTransform is defined in A022562 *)
%t A030268 Join[{1}, EulerInvTransform[Drop[A006966, 3]]] (* _Jean-François Alcover_, May 10 2019, updated Mar 17 2020 *)
%K A030268 nonn,hard
%O A030268 0,4
%A A030268 _Christian G. Bower_, revised Dec 28 2000
%E A030268 a(17) (from A006966) from _Jean-François Alcover_, May 10 2019
%E A030268 a(18) (using A006966) from _Alois P. Heinz_, May 10 2019