A267990 as a triangular array
| | | | | | | | | 1 |
| | | | | | | | | 1 | | 1 |
| | | | | | | | 1 | | 4 | | 1 |
| | | | | | | 1 | | 5 | | 21 | | 1 |
| | | | | | 1 | | 15 | | 145 | | 189 | | 1 |
| | | | | 1 | | 21 | | 1122 | | 7477 | | 1941 | | 1 |
| | | | 1 | | 57 | | 7886 | | 425488 | | 760736 | | 28032 | | 1 |
| | | 1 | | 85 | | 58446 | | 20924732 | | 399858087 | | 122958209 | | 448157 | | 1 |
| | 1 | | 220 | | 405196 | | 1102544770 |
|
A267990 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 4 | 5 | 15 | 21 | 57 | 85 | 220
| | 1 | 21 | 145 | 1122 | 7886 | 58446 | 405196
| | 1 | 189 | 7477 | 425488 | 20924732 | 1102544770
| | 1 | 1941 | 760736 | 399858087
| | 1 | 28032 | 122958209
| | 1 | 448157
| | 1
|
A267990 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 4 | 5 | 15 | 21 | 57 | 85 | 220
| | | 1 | 21 | 145 | 1122 | 7886 | 58446 | 405196
| | | | 1 | 189 | 7477 | 425488 | 20924732 | 1102544770
| | | | | 1 | 1941 | 760736 | 399858087
| | | | | | 1 | 28032 | 122958209
| | | | | | | 1 | 448157
| | | | | | | | 1
| | | | | | | |
|
|
