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REFERENCES
| Choudum, S. A.; Parthasarathy, K. R. Semi-regular relations and digraphs. Nederl. Akad. Wetensch. Proc. Ser. A. {75}=Indag. Math. 34 (1972), 326-334.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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