References

1. G. H. Hardy & E. M. Wright (1979): An introduction to the theory of numbers. The Clarendon Press, Oxford University Press, New York.
2. Kenneth R. Rebman (1975): The sequence: 1 5 16 45 121 320in combinatorics. Fibonacci Quart. 13, pp. 51–55.
3. Beno^ıt Rittaud & Laurent Vivier: Circular words and three applications: factors of the Fibonacci word, F-adic numbers, and the sequence 1, 5, 16, 45, 121, 320,. To appear in Functiones et Approximatio Commentarii Mathematici.
4. N.J.A. Sloane: Alternate Lucas numbers - 2. Available at http://oeis.org/A004146.

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