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REFERENCES
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M. A. Harrison, The number of classes of invertible Boolean functions, J. ACM 10 (1963), 25-28.
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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