A091491 as a triangular array
| | | | | | | | | | | 1 |
| | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | 1 | | 2 | | 1 |
| | | | | | | | | 1 | | 4 | | 3 | | 1 |
| | | | | | | | 1 | | 9 | | 8 | | 4 | | 1 |
| | | | | | | 1 | | 23 | | 22 | | 13 | | 5 | | 1 |
| | | | | | 1 | | 65 | | 64 | | 41 | | 19 | | 6 | | 1 |
| | | | | 1 | | 197 | | 196 | | 131 | | 67 | | 26 | | 7 | | 1 |
| | | | 1 | | 626 | | 625 | | 428 | | 232 | | 101 | | 34 | | 8 | | 1 |
| | | 1 | | 2056 | | 2055 | | 1429 | | 804 | | 376 | | 144 | | 43 | | 9 | | 1 |
| | 1 | | 6918 | | 6917 | | 4861 | | 2806 | | 1377 | | 573 | | 197 | | 53 | | 10 | | 1 |
|
A091491 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 2 | 4 | 9 | 23 | 65 | 197 | 626 | 2056 | 6918
| | 1 | 3 | 8 | 22 | 64 | 196 | 625 | 2055 | 6917
| | 1 | 4 | 13 | 41 | 131 | 428 | 1429 | 4861
| | 1 | 5 | 19 | 67 | 232 | 804 | 2806
| | 1 | 6 | 26 | 101 | 376 | 1377
| | 1 | 7 | 34 | 144 | 573
| | 1 | 8 | 43 | 197
| | 1 | 9 | 53
| | 1 | 10
| | 1
|
A091491 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 2 | 4 | 9 | 23 | 65 | 197 | 626 | 2056 | 6918
| | | 1 | 3 | 8 | 22 | 64 | 196 | 625 | 2055 | 6917
| | | | 1 | 4 | 13 | 41 | 131 | 428 | 1429 | 4861
| | | | | 1 | 5 | 19 | 67 | 232 | 804 | 2806
| | | | | | 1 | 6 | 26 | 101 | 376 | 1377
| | | | | | | 1 | 7 | 34 | 144 | 573
| | | | | | | | 1 | 8 | 43 | 197
| | | | | | | | | 1 | 9 | 53
| | | | | | | | | | 1 | 10
| | | | | | | | | | | 1
|
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