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 A349367 #19 Jul 01 2022 09:39:52 %S A349367 0,1,2,6,18,65,241,984,4250,19590,95484,491459,2660030,15100494, %T A349367 89648378 %N A349367 Number of n-element unlabeled disconnected N-free posets. %H A349367 Soheir M. Khamis, <a href="https://doi.org/10.1016/S0012-365X(03)00106-7">Height counting of unlabeled interval and N-free posets</a>, Discrete Math. 275 (2004), no. 1-3, 165-175. %H A349367 Salah Uddin Mohammad, Md. Shah Noor, and Md. Rashed Talukder, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL25/Uddin/uddin6.html">An Exact Enumeration of the Unlabeled Disconnected Posets</a>, J. Int. Seq., Vol. 25 (2022), Article 22.5.4. %F A349367 a(n) = A202182(n) - A202180(n). %Y A349367 Cf. A202182, A202180. %K A349367 nonn,more %O A349367 1,3 %A A349367 _Salah Uddin Mohammad_, Nov 15 2021