%I A007669 M1135
%S A007669 1,2,4,8,16,36,80
%N A007669 Number of orthogonal lattices in dimension n.
%D A007669 R. L. E. Schwarzenberger, Crystallography in spaces of arbitrary dimension, 
               Proc. Camb. Phil. Soc., 76 (1974), 23-32.
%D A007669 R. L. E. Schwarzenberger, $N$-Dimensional Crystallography. Pitman, London, 
               1980, p. 65.
%D A007669 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%Y A007669 Sequence in context: A126137 A085294 A034340 this_sequence A034341 A034342 
               A034343
%Y A007669 Adjacent sequences: A007666 A007667 A007668 this_sequence A007670 A007671 
               A007672
%K A007669 nonn
%O A007669 1,2
%A A007669 N. J. A. Sloane (njas(AT)research.att.com).