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REFERENCES
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Rosa, Alexander; Znam, Stefan; A combinatorial problem in the theory of congruences. (Russian) Mat.-Fys. Casopis Sloven. Akad. Vied 15 1965 49-59.
Rosa, Alexander; Znam, Stefan; A remark on a combinatorial problem. (Russian) Mat.-Fyz. Casopis Sloven. Akad. Vied 15 1965 313-316.
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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