A215204 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 1 |
| | | | | | | | | 1 | | 1 | | 2 |
| | | | | | | | 1 | | 1 | | 2 | | 3 |
| | | | | | | 1 | | 1 | | 4 | | 4 | | 5 |
| | | | | | 1 | | 1 | | 10 | | 26 | | 10 | | 7 |
| | | | | 1 | | 1 | | 28 | | 276 | | 258 | | 26 | | 11 |
| | | | 1 | | 1 | | 84 | | 3740 | | 14318 | | 3346 | | 76 | | 15 |
| | | 1 | | 1 | | 264 | | 58604 | | 1161678 | | 1214358 | | 54108 | | 232 | | 22 |
| | 1 | | 1 | | 858 | | 1010616 | | 118316062 | | 741215012 | | 150910592 | | 1054256 | | 764 | | 30 |
|
A215204 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 2 | 2 | 4 | 10 | 28 | 84 | 264 | 858
| | 3 | 4 | 26 | 276 | 3740 | 58604 | 1010616
| | 5 | 10 | 258 | 14318 | 1161678 | 118316062
| | 7 | 26 | 3346 | 1214358 | 741215012
| | 11 | 76 | 54108 | 150910592
| | 15 | 232 | 1054256
| | 22 | 764
| | 30
|
A215204 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 | 2 | 4 | 10 | 28 | 84 | 264 | 858
| | | | 3 | 4 | 26 | 276 | 3740 | 58604 | 1010616
| | | | | 5 | 10 | 258 | 14318 | 1161678 | 118316062
| | | | | | 7 | 26 | 3346 | 1214358 | 741215012
| | | | | | | 11 | 76 | 54108 | 150910592
| | | | | | | | 15 | 232 | 1054256
| | | | | | | | | 22 | 764
| | | | | | | | | | 30
|
|
