A166884 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 1 |
| | | | | | | | | 3 | | 2 | | 1 |
| | | | | | | | 15 | | 9 | | 3 | | 1 |
| | | | | | | 114 | | 62 | | 18 | | 4 | | 1 |
| | | | | | 1159 | | 593 | | 157 | | 30 | | 5 | | 1 |
| | | | | 14838 | | 7266 | | 1812 | | 316 | | 45 | | 6 | | 1 |
| | | | 229401 | | 108720 | | 25989 | | 4271 | | 555 | | 63 | | 7 | | 1 |
| | | 4159662 | | 1922166 | | 445255 | | 70180 | | 8595 | | 890 | | 84 | | 8 | | 1 |
| | 86580636 | | 39212154 | | 8865333 | | 1354750 | | 159171 | | 15534 | | 1337 | | 108 | | 9 | | 1 |
|
A166884 as a square array
| 1 | 1 | 3 | 15 | 114 | 1159 | 14838 | 229401 | 4159662 | 86580636
| | 1 | 2 | 9 | 62 | 593 | 7266 | 108720 | 1922166 | 39212154
| | 1 | 3 | 18 | 157 | 1812 | 25989 | 445255 | 8865333
| | 1 | 4 | 30 | 316 | 4271 | 70180 | 1354750
| | 1 | 5 | 45 | 555 | 8595 | 159171
| | 1 | 6 | 63 | 890 | 15534
| | 1 | 7 | 84 | 1337
| | 1 | 8 | 108
| | 1 | 9
| | 1
|
A166884 as an upper right triangle
| 1 | 1 | 3 | 15 | 114 | 1159 | 14838 | 229401 | 4159662 | 86580636
| | 1 | 2 | 9 | 62 | 593 | 7266 | 108720 | 1922166 | 39212154
| | | 1 | 3 | 18 | 157 | 1812 | 25989 | 445255 | 8865333
| | | | 1 | 4 | 30 | 316 | 4271 | 70180 | 1354750
| | | | | 1 | 5 | 45 | 555 | 8595 | 159171
| | | | | | 1 | 6 | 63 | 890 | 15534
| | | | | | | 1 | 7 | 84 | 1337
| | | | | | | | 1 | 8 | 108
| | | | | | | | | 1 | 9
| | | | | | | | | | 1
|
|
