A242892 - OEIS

%I #11 Jun 18 2014 11:53:47

%S 9,9,18,27,27,18

%N Beginning with a centrally symmetric 'Star' configuration of 9 rhombi with rotational symmetry, number of tiles that can be added to the free edges of the tiling.

%H S. Weber, <a href="http://www.jcrystal.com/steffenweber/JAVA/jtiling/jtiling.html">Fourier transform on quasiperiodic point sets</a> (select '9-fold' with 'shift (n-1)/(2n)')

%Y Cf. A242128, A242129, A242888, A242889, A242890, A242891, A242893, A242894, A242895.

%K nonn,more

%O 1,1

%A _Felix Fröhlich_, May 25 2014