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 A324919 #8 Sep 10 2019 21:49:04 %S A324919 2,2,12,28,80,180,476,1120,2772,6640,16236,38976 %N A324919 a(n) is the number of I^n-symmetric chains that are not I^k-symmetric for any k dividing n. %C A324919 a(1)-a(12) are the terms of sequence b_n given in row 2 of table I. in Hermisson, Richard, Baake, 1997. %H A324919 Joachim Hermisson, Christoph Richard and Michael Baake, <a href="https://hal.archives-ouvertes.fr/jpa-00247374">A Guide to the Symmetry Structure of Quasiperiodic Tiling Classes</a>, Journal de Physique I, Vol. 7, No. 8 (1997), 1003-1018, DOI:<a href="https://doi.org/10.1051/jp1:1997200">10.1051/jp1:1997200</a>. %Y A324919 Cf. A129744 (sequence a_n in the paper). %K A324919 nonn,more %O A324919 1,1 %A A324919 _Felix Fröhlich_, Sep 04 2019