A291261 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 1 |
| | | | | | | | | 1 | | 1 | | 2 |
| | | | | | | | 1 | | 1 | | 4 | | 5 |
| | | | | | | 1 | | 1 | | 10 | | 31 | | 14 |
| | | | | | 1 | | 1 | | 28 | | 325 | | 364 | | 42 |
| | | | | 1 | | 1 | | 82 | | 4159 | | 22150 | | 5746 | | 132 |
| | | | 1 | | 1 | | 244 | | 57349 | | 1790452 | | 2586250 | | 113944 | | 429 |
| | | 1 | | 1 | | 730 | | 818911 | | 162045118 | | 1691509906 | | 461242900 | | 2719291 | | 1430 |
| | 1 | | 1 | | 2188 | | 11923525 | | 15520964284 | | 1289803048426 | | 2978600051368 | | 116651486125 | | 75843724 | | 4862 |
|
A291261 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 2 | 4 | 10 | 28 | 82 | 244 | 730 | 2188
| | 5 | 31 | 325 | 4159 | 57349 | 818911 | 11923525
| | 14 | 364 | 22150 | 1790452 | 162045118 | 15520964284
| | 42 | 5746 | 2586250 | 1691509906 | 1289803048426
| | 132 | 113944 | 461242900 | 2978600051368
| | 429 | 2719291 | 116651486125
| | 1430 | 75843724
| | 4862
|
A291261 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | | 2 | 4 | 10 | 28 | 82 | 244 | 730 | 2188
| | | | 5 | 31 | 325 | 4159 | 57349 | 818911 | 11923525
| | | | | 14 | 364 | 22150 | 1790452 | 162045118 | 15520964284
| | | | | | 42 | 5746 | 2586250 | 1691509906 | 1289803048426
| | | | | | | 132 | 113944 | 461242900 | 2978600051368
| | | | | | | | 429 | 2719291 | 116651486125
| | | | | | | | | 1430 | 75843724
| | | | | | | | | | 4862
|
|
