Example: for n = 4, the following diagram gives a minimal polyomino of a(4) = 6 tiles:
+---+---+
| 1 | 4 |
+---+---+---+
| 4 | 3 | 2 |
+---+---+---+
| 1 |
+---+
Example: for n = 10, the following diagram gives a minimal polyomino of a(10) = 30 tiles. Note that redundant adjacencies, e.g., between 2 and 7, can exist in minimal diagrams.
+---+---+
| 8 | 6 |
+---+---+---+---+---+
| 3 | 2 | 5 | 9 | 4 |
+---+---+---+---+---+---+---+---+
| 2 | 7 | 5 | 1 | 4 | 2 | 10| 9 |
+---+---+---+---+---+---+---+---+
| 6 | 9 | 8 | 3 | 6 | 7 | 8 | 1 |
+---+---+---+---+---+---+---+---+
| 10| 3 | 4 | 7 | 1 | 10| 5 |
+---+---+---+---+---+---+---+
Example for n = 11:
+---+---+---+---+---+
| 9 | 11| 2 | 5 | 8 |
+---+---+---+---+---+---+
| 1 | 5 | 10| 9 | 2 | 1 |
+---+---+---+---+---+---+
| 4 | 6 | 11| 8 | 7 | 3 |
+---+---+---+---+---+---+
| 3 | 9 | 7 | 10| 6 | 2 |
+---+---+---+---+---+---+
| 11| 4 | 5 | 3 | 8 | 4 |
+---+---+---+---+---+---+
| 1 | 10| | 6 | 1 | 7 |
+---+---+ +---+---+---+
(End)
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