Catalogue of Almost Almost Unitary Polyominoes
Introduction
A polyomino is a figure made of equal squares joined
edge to edge.
A unitary polyomino is one whose edges all have length 1;
see Catalogue of Unitary Polyominoes.
An almost unitary polyomino has just one edge of length
greater than 1.
An almost almost unitary polyomino has just two edges of length
greater than 1.
See also Catalogue of Unitary Polyominoes
and Catalogue of Almost Unitary Polyominoes.
Enumeration
Cells
 2  3  4  5  6  7  8  9  10  11  12  13
 14  15  16  17  18 
Almost Almost Unitary Polyominoes
 1  2  2  4  12  15  29  58  116  199  403  790
 1509  2857  5700  10941  21032

The shaded values were found by John Mason in 2023.
2 Cells
3 Cells
4 Cells
5 Cells
6 Cells
7 Cells
8 Cells
9 Cells
10 Cells
Last revised 20230501.
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Col. George Sicherman
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