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REFERENCES
| N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
N. Lichiardopol, Independence number of de Bruijn graphs, Discrete Math., 306 (2006),no.12, 1145-1160. [From Herman Jamke (hermanjamke(AT)fastmail.fm), Sep 07 2010]
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