A209831 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 3 |
| | | | | | | | | 1 | | 5 | | 8 |
| | | | | | | | 1 | | 8 | | 20 | | 21 |
| | | | | | | 1 | | 10 | | 41 | | 71 | | 55 |
| | | | | | 1 | | 13 | | 65 | | 176 | | 235 | | 144 |
| | | | | 1 | | 15 | | 99 | | 338 | | 684 | | 744 | | 377 |
| | | | 1 | | 18 | | 135 | | 590 | | 1536 | | 2490 | | 2285 | | 987 |
| | | 1 | | 20 | | 182 | | 926 | | 3031 | | 6382 | | 8651 | | 6865 | | 2584 |
| | 1 | | 23 | | 230 | | 1388 | | 5359 | | 14065 | | 24875 | | 29020 | | 20284 | | 6765 |
|
A209831 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 3 | 5 | 8 | 10 | 13 | 15 | 18 | 20 | 23
| | 8 | 20 | 41 | 65 | 99 | 135 | 182 | 230
| | 21 | 71 | 176 | 338 | 590 | 926 | 1388
| | 55 | 235 | 684 | 1536 | 3031 | 5359
| | 144 | 744 | 2490 | 6382 | 14065
| | 377 | 2285 | 8651 | 24875
| | 987 | 6865 | 29020
| | 2584 | 20284
| | 6765
|
A209831 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 3 | 5 | 8 | 10 | 13 | 15 | 18 | 20 | 23
| | | 8 | 20 | 41 | 65 | 99 | 135 | 182 | 230
| | | | 21 | 71 | 176 | 338 | 590 | 926 | 1388
| | | | | 55 | 235 | 684 | 1536 | 3031 | 5359
| | | | | | 144 | 744 | 2490 | 6382 | 14065
| | | | | | | 377 | 2285 | 8651 | 24875
| | | | | | | | 987 | 6865 | 29020
| | | | | | | | | 2584 | 20284
| | | | | | | | | | 6765
|
|
