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REFERENCES
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Gustavus J. Simmons, The ochromatic number of planar graphs, pp. 295-316 of F. Harary and J. S. Maybee, editors, Graphs and Applications. Wiley, NY, 1985.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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