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 A361959 #7 Apr 03 2023 21:09:05 %S A361959 1,1,1,3,8,25,83,330,1538,8834,63723,591313,7180087,115411088, %T A361959 2472336977,70840464484,2720170935989,140167035897433, %U A361959 9702508891845883,903305670556552694,113233954374954246849,19137449587197829494989,4366006746295284220605007 %N A361959 Number of connected unlabeled tiered posets with n elements. %C A361959 A tiered poset is a partially ordered set in which every maximal chain has the same length. %H A361959 Andrew Howroyd, <a href="/A361959/b361959.txt">Table of n, a(n) for n = 0..40</a> %o A361959 (PARI) \\ See PARI link in A361957 for program code. %o A361959 A361959seq(20) \\ _Andrew Howroyd_, Apr 03 2023 %Y A361959 Row sums of A361958. %Y A361959 Cf. A361912 (not necessarily connected). %K A361959 nonn %O A361959 0,4 %A A361959 _Andrew Howroyd_, Apr 03 2023