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A note on the number of functional digraphs. (English) Zbl 0096.38201

Keywords:
topology
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References:
[1] Davis, R. L.: The number of structures of finite relations. Proc. Am. Math. Soc.4, 486-495 (1953). · Zbl 0051.24702
[2] Harary, F.: The number of functional digraphs. Math. Ann.138, 203-210 (1959). · Zbl 0087.38703
[3] Hardy, G. H., andE. M. Wright: An introduction to the theory of numbers. Oxford 1945. · Zbl 0020.29201
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