A010028 formatted as a triangular array:
| | | | | | | | 1 | | | | | | | | |
| | | | | | | 1 | | 0 | | | | | | | |
| | | | | | 1 | | 2 | | 0 | | | | | | |
| | | | | 1 | | 5 | | 5 | | 1 | | | | | |
| | | | 1 | | 8 | | 24 | | 20 | | 7 | | | | |
| | | 1 | | 11 | | 60 | | 128 | | 115 | | 45 | | | |
| | 1 | | 14 | | 113 | | 444 | | 835 | | 790 | | 323 | | |
| 1 | | 17 | | 183 | | 1099 | | 3599 | | 6423 | | 6217 | | 2621 | |
| 1 | | 20 | | 270 | | 2224 | | 11060 | | 32484 | | 56410 | | 55160 | | 23811 |
A010028 formatted as a square array:
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 0 | 2 | 5 | 8 | 11 | 14 | 17 | 20 | |
| 0 | 5 | 24 | 60 | 113 | 183 | 270 | | |
| 1 | 20 | 128 | 444 | 1099 | 2224 | | | |
| 7 | 115 | 835 | 3599 | 11060 | | | | |
| 45 | 790 | 6423 | 32484 | | | | | |
| 323 | 6217 | 56410 | | | | | | |
| 2621 | 55160 | | | | | | | |
| 23811 | | | | | | | | |
A010028 formatted as an upper right triangle:
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 0 | 2 | 5 | 8 | 11 | 14 | 17 | 20 |
| | 0 | 5 | 24 | 60 | 113 | 183 | 270 |
| | | 1 | 20 | 128 | 444 | 1099 | 2224 |
| | | | 7 | 115 | 835 | 3599 | 11060 |
| | | | | 45 | 790 | 6423 | 32484 |
| | | | | | 323 | 6217 | 56410 |
| | | | | | | 2621 | 55160 |
| | | | | | | | 23811 |
|
