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REFERENCES
| M. B. Dillencourt, personal communication.
J. McClellan, The question of allomorphs, J. Rec. Math., 4 (1971), 115-123.
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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