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References
Davis, R. L.: The number of structures of finite relations. Proc. Am. Math. Soc.4, 486–495 (1953).
Harary, F.: The number of functional digraphs. Math. Ann.138, 203–210 (1959).
Hardy, G. H., andE. M. Wright: An introduction to the theory of numbers. Oxford 1945.
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Read, R.C. A note on the number of functional digraphs. Math. Ann. 143, 109–110 (1961). https://doi.org/10.1007/BF01342974
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DOI: https://doi.org/10.1007/BF01342974