A261780 as a triangular array
| | | | | | | | | | | 1 |
| | | | | | | | | | | 1 | | 0 |
| | | | | | | | | | 1 | | 1 | | 0 |
| | | | | | | | | 1 | | 2 | | 2 | | 0 |
| | | | | | | | 1 | | 3 | | 7 | | 4 | | 0 |
| | | | | | | 1 | | 4 | | 15 | | 24 | | 8 | | 0 |
| | | | | | 1 | | 5 | | 26 | | 73 | | 82 | | 16 | | 0 |
| | | | | 1 | | 6 | | 40 | | 164 | | 354 | | 280 | | 32 | | 0 |
| | | | 1 | | 7 | | 57 | | 310 | | 1031 | | 1716 | | 956 | | 64 | | 0 |
| | | 1 | | 8 | | 77 | | 524 | | 2395 | | 6480 | | 8318 | | 3264 | | 128 | | 0 |
| | 1 | | 9 | | 100 | | 819 | | 4803 | | 18501 | | 40728 | | 40320 | | 11144 | | 256 | | 0 |
|
A261780 as a square array
1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
| 0 | 2 | 7 | 15 | 26 | 40 | 57 | 77 | 100
| 0 | 4 | 24 | 73 | 164 | 310 | 524 | 819
| 0 | 8 | 82 | 354 | 1031 | 2395 | 4803
| 0 | 16 | 280 | 1716 | 6480 | 18501
| 0 | 32 | 956 | 8318 | 40728
| 0 | 64 | 3264 | 40320
| 0 | 128 | 11144
| 0 | 256
| 0
|
A261780 as an upper right triangle
1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
| | | 0 | 2 | 7 | 15 | 26 | 40 | 57 | 77 | 100
| | | | 0 | 4 | 24 | 73 | 164 | 310 | 524 | 819
| | | | | 0 | 8 | 82 | 354 | 1031 | 2395 | 4803
| | | | | | 0 | 16 | 280 | 1716 | 6480 | 18501
| | | | | | | 0 | 32 | 956 | 8318 | 40728
| | | | | | | | 0 | 64 | 3264 | 40320
| | | | | | | | | 0 | 128 | 11144
| | | | | | | | | | 0 | 256
| | | | | | | | | | | 0
|
|