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REFERENCES
| J. Devisme, Contribution a l'etude du probleme des timbres-poste, Sphinx, 7 (Dec. 1937), 202-203.
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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