The Number Triangle obtained by starting with a row containing a single ``1'' and the next row containing three 1s and then letting subsequent row elements be computed by summing the elements above to the left, directly above, and above to the right:

and so on.

**References**

Sloane, N. J. A. Sequence A027907 in ``The On-Line Version of the Encyclopedia of Integer Sequences.'' http://www.research.att.com/~njas/sequences/eisonline.html.

© 1996-9

1999-05-26