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 A307292 #11 Apr 09 2019 03:23:00 %S A307292 0,3,46,1156,51987 %N A307292 Number of black-and-white colored (or proper magnetic) space groups in dimension n, not counting enantiomorphs. %H A307292 R. L. E. Schwarzenberger, <a href="https://doi.org/10.1112/blms/16.3.209">Colour symmetry</a>, Bulletin of the London Mathematical Society 16.3 (1984): 216-229. %H A307292 B. Souvignier, <a href="https://doi.org/10.1107/S0108767303004161">Enantiomorphism of crystallographic groups in higher dimensions with results in dimensions up to 6</a>, Acta Cryst., A59 (2003), 210-220. %F A307292 a(n) = A293062(n, n) - 2 * A004029(n). - _Andrey Zabolotskiy_, Apr 09 2019 %Y A307292 For the case when enantiomorphs are counted see A307290. %Y A307292 Cf. A004029, A293062. %K A307292 nonn,more %O A307292 0,2 %A A307292 _N. J. A. Sloane_, Apr 08 2019 %E A307292 a(0), a(4) from _Andrey Zabolotskiy_, Apr 09 2019