Polyrects are polyforms obtained from a rectangular grid, illustrated above.
The numbers of polyrects with 
,
2, ... components are 1, 2, 3, 9, 21, 68, 208, ... (OEIS A056780),
the first few of which are illustrated above.
Polyrect
See also
Polyform, RectangleExplore with Wolfram|Alpha
References
Clarke, A. L. "The Poly Pages." http://www.recmath.com/PolyPages/.Owen, B. "Polyforms." http://tech.groups.yahoo.com/group/polyforms/.Sloane, N. J. A. Sequence A056780 in "The On-Line Encyclopedia of Integer Sequences."Referenced on Wolfram|Alpha
PolyrectCite this as:
Weisstein, Eric W. "Polyrect." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Polyrect.html