A001498 formatted as a triangular array:
| | | | | | | | 1 | | | | | | | | |
| | | | | | | 1 | | 1 | | | | | | | |
| | | | | | 1 | | 3 | | 3 | | | | | | |
| | | | | 1 | | 6 | | 15 | | 15 | | | | | |
| | | | 1 | | 10 | | 45 | | 105 | | 105 | | | | |
| | | 1 | | 15 | | 105 | | 420 | | 945 | | 945 | | | |
| | 1 | | 21 | | 210 | | 1260 | | 4725 | | 10395 | | 10395 | | |
| 1 | | 28 | | 378 | | 3150 | | 17325 | | 62370 | | 135135 | | 135135 | |
| 1 | | 36 | | 630 | | 6930 | | 51975 | | 270270 | | 945945 | | 2027025 | | 2027025 |
A001498 formatted as a square array:
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 3 | 6 | 10 | 15 | 21 | 28 | 36 | |
| 3 | 15 | 45 | 105 | 210 | 378 | 630 | | |
| 15 | 105 | 420 | 1260 | 3150 | 6930 | | | |
| 105 | 945 | 4725 | 17325 | 51975 | | | | |
| 945 | 10395 | 62370 | 270270 | | | | | |
| 10395 | 135135 | 945945 | | | | | | |
| 135135 | 2027025 | | | | | | | |
| 2027025 | | | | | | | | |
A001498 formatted as an upper right triangle:
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 3 | 6 | 10 | 15 | 21 | 28 | 36 |
| | 3 | 15 | 45 | 105 | 210 | 378 | 630 |
| | | 15 | 105 | 420 | 1260 | 3150 | 6930 |
| | | | 105 | 945 | 4725 | 17325 | 51975 |
| | | | | 945 | 10395 | 62370 | 270270 |
| | | | | | 10395 | 135135 | 945945 |
| | | | | | | 135135 | 2027025 |
| | | | | | | | 2027025 |
|
