A307290 Number of black-and-white colored (or proper magnetic) space groups in dimension n, counting enantiomorphs.

0, 3, 46, 1191, 52439

Offset: 0

Author

N. J. A. Sloane, Apr 08 2019

Keywords

• nonn
• more

Links

• R. L. E. Schwarzenberger, Colour symmetry, Bulletin of the London Mathematical Society 16.3 (1984): 216-229.
• B. Souvignier, Enantiomorphism of crystallographic groups in higher dimensions with results in dimensions up to 6, Acta Cryst., A59 (2003), 210-220.

Crossrefs

Cf. A006227, A307291, A307292.

Formula

a(n) = A307291(n) - 2 * A006227(n). - Andrey Zabolotskiy, Apr 09 2019

Extensions

a(0), a(4) from Andrey Zabolotskiy, Apr 09 2019