A166455 as a triangular array
| | | | | | | | | | | | 1 |
| | | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | | 1 | | 4 | | 1 |
| | | | | | | | | | 1 | | 5 | | 5 | | 1 |
| | | | | | | | | 1 | | 8 | | 12 | | 8 | | 1 |
| | | | | | | | 1 | | 9 | | 20 | | 20 | | 9 | | 1 |
| | | | | | | 1 | | 12 | | 29 | | 40 | | 29 | | 12 | | 1 |
| | | | | | 1 | | 13 | | 41 | | 69 | | 69 | | 41 | | 13 | | 1 |
| | | | | 1 | | 16 | | 56 | | 112 | | 140 | | 112 | | 56 | | 16 | | 1 |
| | | | 1 | | 17 | | 72 | | 168 | | 252 | | 252 | | 168 | | 72 | | 17 | | 1 |
| | | 1 | | 20 | | 89 | | 240 | | 420 | | 504 | | 420 | | 240 | | 89 | | 20 | | 1 |
| | 1 | | 21 | | 109 | | 329 | | 660 | | 924 | | 924 | | 660 | | 329 | | 109 | | 21 | | 1 |
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A166455 as a square array
1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| 1 | 4 | 5 | 8 | 9 | 12 | 13 | 16 | 17 | 20 | 21
| 1 | 5 | 12 | 20 | 29 | 41 | 56 | 72 | 89 | 109
| 1 | 8 | 20 | 40 | 69 | 112 | 168 | 240 | 329
| 1 | 9 | 29 | 69 | 140 | 252 | 420 | 660
| 1 | 12 | 41 | 112 | 252 | 504 | 924
| 1 | 13 | 56 | 168 | 420 | 924
| 1 | 16 | 72 | 240 | 660
| 1 | 17 | 89 | 329
| 1 | 20 | 109
| 1 | 21
| 1
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A166455 as an upper right triangle
1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 4 | 5 | 8 | 9 | 12 | 13 | 16 | 17 | 20 | 21
| | | 1 | 5 | 12 | 20 | 29 | 41 | 56 | 72 | 89 | 109
| | | | 1 | 8 | 20 | 40 | 69 | 112 | 168 | 240 | 329
| | | | | 1 | 9 | 29 | 69 | 140 | 252 | 420 | 660
| | | | | | 1 | 12 | 41 | 112 | 252 | 504 | 924
| | | | | | | 1 | 13 | 56 | 168 | 420 | 924
| | | | | | | | 1 | 16 | 72 | 240 | 660
| | | | | | | | | 1 | 17 | 89 | 329
| | | | | | | | | | 1 | 20 | 109
| | | | | | | | | | | 1 | 21
| | | | | | | | | | | | 1
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