The Integer Sequence defined by the Recurrence Relation

with the initial conditions . The first few terms are 1, 1, 2, 2, 3, 4, 5, 7, 9, 12, ... (Sloane's A000931). The ratio is called the Plastic Constant.

**References**

Sloane, N. J. A. Sequence
A000931/M0284
in ``An On-Line Version of the Encyclopedia of Integer Sequences.''
http://www.research.att.com/~njas/sequences/eisonline.html and Sloane, N. J. A. and Plouffe, S.
*The Encyclopedia of Integer Sequences.* San Diego: Academic Press, 1995.

Stewart, I. ``Tales of a Neglected Number.'' *Sci. Amer.* **274**, 102-103, June 1996.

© 1996-9

1999-05-26