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 A166742 #11 Aug 02 2022 13:01:04 %S A166742 1,4,7,9,19,29,33,76,144,169 %N A166742 Arises in enumeration of three-dimensional crystallographic Seifert and co-Seifert fibrations. %C A166742 p.25 of Ratcliffe: "The information in Table 1 was obtained by computer calculations. Finally, the 10 closed flat space forms in Table 1 have IT numbers 1,4,7,9,19,29,33,76,144,169." %C A166742 The "IT numbers" here are merely numbers of certain 3D space groups in the International Tables for Crystallography. Thus, the terms of this sequence don't have their own mathematical meaning. - _Andrey Zabolotskiy_, Jul 05 2017 %H A166742 John G. Ratcliffe and Steven T. Tschantz, <a href="http://arxiv.org/abs/0804.0427">Fibered orbifolds and crystallographic groups</a>, arXiv:0804.0427 [math.GT], 2008-2009. %Y A166742 Cf. A004029. %K A166742 nonn,fini,full %O A166742 1,2 %A A166742 _Jonathan Vos Post_, Oct 21 2009