Polycairos are polyforms obtained from the Cairo tessellation, illustrated above.
The numbers of polycairos with 
, 2, ... components are 1, 2, 5, 17, 55, 206, 781, 3099,
... (OEIS A159866), the first few of which
are illustrated above.
Polycairo
See also
Cairo Tessellation, PolyformExplore 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 A159866 in "The On-Line Encyclopedia of Integer Sequences."Referenced on Wolfram|Alpha
PolycairoCite this as:
Weisstein, Eric W. "Polycairo." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Polycairo.html