A polyomino-like object made by attaching squares joined either at sides or corners. Because neighboring squares can be in relation to one
another as kings may move on a chessboard,
polyplets are sometimes also called polykings. The number of 
-polyplets (with holes allowed) are 1, 2, 5, 22, 94, 524, 3031,
... (OEIS A030222). The number of 
-polyplets having bilateral symmetry are 1, 2, 4, 10, 22, 57,
131, ... (OEIS A030234). The number of 
-polyplets not having bilateral symmetry
are 0, 0, 1, 12, 72, 467, 2900, ... (OEIS A030235).
The number of fixed 
-polyplets
are 1, 4, 20, 110, 638, 3832, ... (OEIS A006770).
The number of one-sided 
-polyplets
are 1, 2, 6, 34, 166, 991, ... (OEIS A030233).
