A028338 formatted as a triangular array:
| | | | | | | | 1 | | | | | | | | |
| | | | | | | 1 | | 1 | | | | | | | |
| | | | | | 3 | | 4 | | 1 | | | | | | |
| | | | | 15 | | 23 | | 9 | | 1 | | | | | |
| | | | 105 | | 176 | | 86 | | 16 | | 1 | | | | |
| | | 945 | | 1689 | | 950 | | 230 | | 25 | | 1 | | | |
| | 10395 | | 19524 | | 12139 | | 3480 | | 505 | | 36 | | 1 | | |
| 135135 | | 264207 | | 177331 | | 57379 | | 10045 | | 973 | | 49 | | 1 | |
| 2027025 | | 4098240 | | 2924172 | | 1038016 | | 208054 | | 24640 | | 1708 | | 64 | | 1 |
A028338 formatted as a square array:
| 1 | 1 | 3 | 15 | 105 | 945 | 10395 | 135135 | 2027025 |
| 1 | 4 | 23 | 176 | 1689 | 19524 | 264207 | 4098240 | |
| 1 | 9 | 86 | 950 | 12139 | 177331 | 2924172 | | |
| 1 | 16 | 230 | 3480 | 57379 | 1038016 | | | |
| 1 | 25 | 505 | 10045 | 208054 | | | | |
| 1 | 36 | 973 | 24640 | | | | | |
| 1 | 49 | 1708 | | | | | | |
| 1 | 64 | | | | | | | |
| 1 | | | | | | | | |
A028338 formatted as an upper right triangle:
| 1 | 1 | 3 | 15 | 105 | 945 | 10395 | 135135 | 2027025 |
| 1 | 4 | 23 | 176 | 1689 | 19524 | 264207 | 4098240 |
| | 1 | 9 | 86 | 950 | 12139 | 177331 | 2924172 |
| | | 1 | 16 | 230 | 3480 | 57379 | 1038016 |
| | | | 1 | 25 | 505 | 10045 | 208054 |
| | | | | 1 | 36 | 973 | 24640 |
| | | | | | 1 | 49 | 1708 |
| | | | | | | 1 | 64 |
| | | | | | | | 1 |
|
