A001404 as a triangular array
| | | | | | | | | | | | 1 |
| | | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | | 2 | | 2 | | 1 |
| | | | | | | | | | 4 | | 5 | | 2 | | 1 |
| | | | | | | | | 9 | | 11 | | 5 | | 2 | | 1 |
| | | | | | | | 20 | | 25 | | 12 | | 5 | | 2 | | 1 |
| | | | | | | 45 | | 57 | | 27 | | 12 | | 5 | | 2 | | 1 |
| | | | | | 102 | | 129 | | 62 | | 28 | | 12 | | 5 | | 2 | | 1 |
| | | | | 231 | | 293 | | 141 | | 64 | | 28 | | 12 | | 5 | | 2 | | 1 |
| | | | 524 | | 665 | | 321 | | 146 | | 65 | | 28 | | 12 | | 5 | | 2 | | 1 |
| | | 1189 | | 1510 | | 729 | | 333 | | 148 | | 65 | | 28 | | 12 | | 5 | | 2 | | 1 |
| | 2699 | | 3428 | | 1656 |
|
A001404 as a square array
1 | 1 | 2 | 4 | 9 | 20 | 45 | 102 | 231 | 524 | 1189 | 2699
| 1 | 2 | 5 | 11 | 25 | 57 | 129 | 293 | 665 | 1510 | 3428
| 1 | 2 | 5 | 12 | 27 | 62 | 141 | 321 | 729 | 1656
| 1 | 2 | 5 | 12 | 28 | 64 | 146 | 333
| 1 | 2 | 5 | 12 | 28 | 65 | 148
| 1 | 2 | 5 | 12 | 28 | 65
| 1 | 2 | 5 | 12 | 28
| 1 | 2 | 5 | 12
| 1 | 2 | 5
| 1 | 2
| 1
|
A001404 as an upper right triangle
1 | 1 | 2 | 4 | 9 | 20 | 45 | 102 | 231 | 524 | 1189 | 2699
| | 1 | 2 | 5 | 11 | 25 | 57 | 129 | 293 | 665 | 1510 | 3428
| | | 1 | 2 | 5 | 12 | 27 | 62 | 141 | 321 | 729 | 1656
| | | | 1 | 2 | 5 | 12 | 28 | 64 | 146 | 333
| | | | | 1 | 2 | 5 | 12 | 28 | 65 | 148
| | | | | | 1 | 2 | 5 | 12 | 28 | 65
| | | | | | | 1 | 2 | 5 | 12 | 28
| | | | | | | | 1 | 2 | 5 | 12
| | | | | | | | | 1 | 2 | 5
| | | | | | | | | | 1 | 2
| | | | | | | | | | | 1
| | | | | | | | | | |
|
|