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 A350783 #10 Jul 01 2022 09:39:56 %S A350783 1,1,1,3,1,1,9,4,1,1,31,12,4,1,1,115,46,13,4,1,1,474,173,49,13,4,1,1, %T A350783 2097,727,188,50,13,4,1,1,9967,3195,795,191,50,13,4,1,1,50315,15017, %U A350783 3502,810,192,50,13,4,1,1 %N A350783 Triangle read by rows: T(n,k) is the number of n-element unlabeled N-free posets with k connected components. %H A350783 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. %e A350783 Triangle begins: %e A350783 1; %e A350783 1, 1; %e A350783 3, 1, 1; %e A350783 9, 4, 1, 1; %e A350783 31, 12, 4, 1, 1; %e A350783 115, 46, 13, 4, 1, 1; %e A350783 474, 173, 49, 13, 4, 1, 1; %e A350783 2097, 727, 188, 50, 13, 4, 1, 1; %e A350783 9967, 3195, 795, 191, 50, 13, 4, 1, 1; %e A350783 50315, 15017, 3502, 810, 192, 50, 13, 4, 1, 1; %e A350783 ... %Y A350783 Row sums give A202182. %Y A350783 Column 1 is A202180. %Y A350783 Cf. A263864 (all posets), A349488 (disconnected). %K A350783 nonn,tabl %O A350783 1,4 %A A350783 _Salah Uddin Mohammad_, Jan 16 2022