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 A056933 #19 Jun 01 2025 22:52:38 %S A056933 1,336,30900,1301610,32046856,530962446,6479344016,61951251333, %T A056933 485198553532,3217462615688,18528857431906,94529315562186, %U A056933 434088353496446,1817613939845670,7014049051387480,25167786776727516 %N A056933 Antichains (or order ideals) in the poset 2*2*6*n or size of the distributive lattice J(2*2*6*n). %D A056933 Berman and Koehler, Cardinalities of finite distributive lattices, Mitteilungen aus dem Mathematischen Seminar Giessen, 121 (1976), p. 103-124 %H A056933 J. Berman and P. Koehler, <a href="/A006356/a006356.pdf">Cardinalities of finite distributive lattices</a>, Mitteilungen aus dem Mathematischen Seminar Giessen, 121 (1976), 103-124. [Annotated scanned copy] %H A056933 <a href="/index/Pos#posets">Index entries for sequences related to posets</a> %Y A056933 Cf. A000372, A006360, A006361, A006362, A056932, A056934, A056935, A056936, A056937. %K A056933 nonn,easy %O A056933 0,2 %A A056933 _Mitch Harris_