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 A228839 #12 Sep 07 2013 13:49:09 %S A228839 0,0,0,1,20,65,350 %N A228839 Erroneous version of A000453. %C A228839 This is column k=4 of the table on that page. %D A228839 M. Barbut and B. Monjardet, Ordre et classification - algèbre et combinatoire - tome II, Série Méthodes Mathématiques des Sciences de l'Homme, Hachette, Paris, 1970, page 101. %e A228839 The fifth term (20) is a typo for 10. %e A228839 There is another error in this table in the book (entry for k=6, n=7 should be 21 instead of 20) leading to an incorrect row sum of 876 instead of 877 for the n=7 Bell number. %Y A228839 Cf. A000453. %K A228839 dead %O A228839 1,5 %A A228839 _Olivier Gérard_, Sep 05 2013 based on emails by Antreas P. Hatzipolakis (anopolis72 (AT) gmail.com) and _R. J. Mathar_