A121207 formatted as a triangular array:
| | | | | | | | | 1 | | | | | | | | | |
| | | | | | | | 1 | | 1 | | | | | | | | |
| | | | | | | 1 | | 1 | | 2 | | | | | | | |
| | | | | | 1 | | 1 | | 3 | | 5 | | | | | | |
| | | | | 1 | | 1 | | 4 | | 9 | | 15 | | | | | |
| | | | 1 | | 1 | | 5 | | 14 | | 31 | | 52 | | | | |
| | | 1 | | 1 | | 6 | | 20 | | 54 | | 121 | | 203 | | | |
| | 1 | | 1 | | 7 | | 27 | | 85 | | 233 | | 523 | | 877 | | |
| 1 | | 1 | | 8 | | 35 | | 125 | | 400 | | 1101 | | 2469 | | 4140 | |
| 1 | | 1 | | 9 | | 44 | | 175 | | 635 | | 2046 | | 5625 | | 12611 | | 21147 |
A121207 formatted as a square array:
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |
| 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | | |
| 5 | 9 | 14 | 20 | 27 | 35 | 44 | | | |
| 15 | 31 | 54 | 85 | 125 | 175 | | | | |
| 52 | 121 | 233 | 400 | 635 | | | | | |
| 203 | 523 | 1101 | 2046 | | | | | | |
| 877 | 2469 | 5625 | | | | | | | |
| 4140 | 12611 | | | | | | | | |
| 21147 | | | | | | | | | |
A121207 formatted as an upper right triangle:
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| | | 5 | 9 | 14 | 20 | 27 | 35 | 44 |
| | | | 15 | 31 | 54 | 85 | 125 | 175 |
| | | | | 52 | 121 | 233 | 400 | 635 |
| | | | | | 203 | 523 | 1101 | 2046 |
| | | | | | | 877 | 2469 | 5625 |
| | | | | | | | 4140 | 12611 |
| | | | | | | | | 21147 |
|
