A156881 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 1 |
| | | | | | | | | 1 | | 1 | | 2 |
| | | | | | | | 1 | | 1 | | 3 | | 6 |
| | | | | | | 1 | | 1 | | 7 | | 21 | | 24 |
| | | | | | 1 | | 1 | | 13 | | 301 | | 315 | | 120 |
| | | | | 1 | | 1 | | 21 | | 2041 | | 77959 | | 9765 | | 720 |
| | | | 1 | | 1 | | 31 | | 8841 | | 3847285 | | 121226245 | | 615195 | | 5040 |
| | | 1 | | 1 | | 43 | | 28861 | | 74450061 | | 87029433985 | | 1131162092095 | | 78129765 | | 40320 |
| | 1 | | 1 | | 57 | | 77701 | | 806116591 | | 12538953723681 | | 23624400943530205 | | 63330372050122765 | | 19923090075 | | 362880 |
|
A156881 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 2 | 3 | 7 | 13 | 21 | 31 | 43 | 57
| | 6 | 21 | 301 | 2041 | 8841 | 28861 | 77701
| | 24 | 315 | 77959 | 3847285 | 74450061 | 806116591
| | 120 | 9765 | 121226245 | 87029433985 | 12538953723681
| | 720 | 615195 | 1131162092095 | 23624400943530205
| | 5040 | 78129765 | 63330372050122765
| | 40320 | 19923090075
| | 362880
|
A156881 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 | 3 | 7 | 13 | 21 | 31 | 43 | 57
| | | | 6 | 21 | 301 | 2041 | 8841 | 28861 | 77701
| | | | | 24 | 315 | 77959 | 3847285 | 74450061 | 806116591
| | | | | | 120 | 9765 | 121226245 | 87029433985 | 12538953723681
| | | | | | | 720 | 615195 | 1131162092095 | 23624400943530205
| | | | | | | | 5040 | 78129765 | 63330372050122765
| | | | | | | | | 40320 | 19923090075
| | | | | | | | | | 362880
|
|
