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A Figurate Number which is equal to the Cubic Number 
. The first few are 1, 8, 27, 64, ...
(Sloane's A000578).
References
Conway, J. H. and Guy, R. K. The Book of Numbers. New York: Springer-Verlag, pp. 42-44, 1996.
Sloane, N. J. A. Sequence
A000578/M4499
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.