## Centered Polygonal Number

A Figurate Number in which layers of Polygons are drawn centered about a point instead of with the point at a Vertex.

Sloane, N. J. A. Sequence A001844/M3826 in An On-Line Version of the Encyclopedia of Integer Sequences.'' http://www.research.att.com/~njas/sequences/eisonline.html and extended entry in Sloane, N. J. A. and Plouffe, S. The Encyclopedia of Integer Sequences. San Diego: Academic Press, 1995.