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 A022017 #43 Nov 19 2024 22:11:14 %S A022017 1,3,8,29,103,442,1953,9502,48533,262634,1485764,8777397,53869119 %N A022017 Number of connected partially ordered sets with n "lines": pairs (a,b) where a < b and there is no c with a < c < b. The lines form the minimal basis for the partial ordering. %C A022017 The points are unlabeled. %D A022017 See A000112 for references and links about partially ordered sets. %H A022017 N. J. A. Sloane, <a href="/A022016/a022016.jpg">Illustration of initial terms of A022016 and A022017.</a> %H A022017 <a href="/index/Pos#posets">Index entries for sequences related to posets</a> %e A022017 See Sloane's link. %Y A022017 Cf. A000112, A000608, A022016. Column sums of A342590. %K A022017 nonn,hard,more %O A022017 1,2 %A A022017 _Franklin T. Adams-Watters_, Mar 30 2002 %E A022017 a(6)-a(9) from A342590. - _R. J. Mathar_, Mar 21 2021 %E A022017 a(10)-a(13) from Rico Zöllner and _Konrad Handrich_, Nov 19 2024