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 A229202 #15 Apr 18 2021 01:46:06 %S A229202 1,1,1,1,2,4,8,17,38,88,212,530,1376,3693,10232,29231,85906,259291, %T A229202 802308,2540635,8220218,27134483,91258141,312324027,1086545705, %U A229202 3838581926 %N A229202 Number of semimodular lattices on n nodes. %H A229202 P. Jipsen and N. Lawless, <a href="http://math.chapman.edu/~jipsen/preprints/JipsenLawlessModularLattices20130905.pdf">Generating all modular lattices of a given size</a> %H A229202 J. Kohonen, <a href="http://arxiv.org/abs/1708.03750">Generating modular lattices up to 30 elements</a>, arXiv:1708.03750 [math.CO] preprint (2017). %Y A229202 Cf. A006966 (number of lattices), A006981 (number of modular lattices). %K A229202 nonn,more %O A229202 0,5 %A A229202 _Nathan Lawless_, Sep 15 2013 %E A229202 a(23)-a(25) from Kohonen (2017), by _Jukka Kohonen_, Aug 15 2017