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REFERENCES
| R. L. E. Schwarzenberger, Crystallography in spaces of arbitrary dimension, Proc. Camb. Phil. Soc., 76 (1974), 23-32.
R. L. E. Schwarzenberger, $N$-Dimensional Crystallography. Pitman, London, 1980, p. 65.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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