A087644 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 3 |
| | | | | | | | | 1 | | 6 | | 12 |
| | | | | | | | 1 | | 10 | | 36 | | 60 |
| | | | | | | 1 | | 15 | | 86 | | 240 | | 360 |
| | | | | | 1 | | 21 | | 176 | | 756 | | 1800 | | 2520 |
| | | | | 1 | | 28 | | 323 | | 1988 | | 7092 | | 15120 | | 20160 |
| | | | 1 | | 36 | | 547 | | 4572 | | 22996 | | 71856 | | 141120 | | 181440 |
| | | 1 | | 45 | | 871 | | 9495 | | 64144 | | 278820 | | 787824 | | 1451520 | | 1814400 |
| | 1 | | 55 | | 1321 | | 18205 | | 159094 |
|
A087644 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 3 | 6 | 10 | 15 | 21 | 28 | 36 | 45 | 55
| | 12 | 36 | 86 | 176 | 323 | 547 | 871 | 1321
| | 60 | 240 | 756 | 1988 | 4572 | 9495 | 18205
| | 360 | 1800 | 7092 | 22996 | 64144 | 159094
| | 2520 | 15120 | 71856 | 278820
| | 20160 | 141120 | 787824
| | 181440 | 1451520
| | 1814400
|
A087644 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 3 | 6 | 10 | 15 | 21 | 28 | 36 | 45 | 55
| | | 12 | 36 | 86 | 176 | 323 | 547 | 871 | 1321
| | | | 60 | 240 | 756 | 1988 | 4572 | 9495 | 18205
| | | | | 360 | 1800 | 7092 | 22996 | 64144 | 159094
| | | | | | 2520 | 15120 | 71856 | 278820
| | | | | | | 20160 | 141120 | 787824
| | | | | | | | 181440 | 1451520
| | | | | | | | | 1814400
| | | | | | | | |
|
|
