G. H. Hardy
E. M. Wright
1979
An introduction to the theory of numbers
The Clarendon Press, Oxford University Press
New York
Kenneth R. Rebman
1975
The sequence: 1 5 16 45 121 320in combinatorics
Fibonacci Quart.
13
51–55
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
N.J.A. Sloane
Alternate Lucas numbers - 2
http://oeis.org/A004146