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REFERENCES
| R. C. Read, personal communication.
Read, R. C.; Wright, E. M.; Colored graphs: A correction and extension. Canad. J. Math. 22 1970 594-596.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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