A238731 as a triangular array
| | | | | | | | | | | 1 |
| | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | 2 | | 4 | | 1 |
| | | | | | | | | 5 | | 13 | | 7 | | 1 |
| | | | | | | | 13 | | 40 | | 33 | | 10 | | 1 |
| | | | | | | 34 | | 120 | | 132 | | 62 | | 13 | | 1 |
| | | | | | 89 | | 354 | | 483 | | 308 | | 100 | | 16 | | 1 |
| | | | | 233 | | 1031 | | 1671 | | 1345 | | 595 | | 147 | | 19 | | 1 |
| | | | 610 | | 2972 | | 5561 | | 5398 | | 3030 | | 1020 | | 203 | | 22 | | 1 |
| | | 1597 | | 8495 | | 17984 | | 20410 | | 13893 | | 5943 | | 1610 | | 268 | | 25 | | 1 |
| | 4181 |
|
A238731 as a square array
1 | 1 | 2 | 5 | 13 | 34 | 89 | 233 | 610 | 1597 | 4181
| 1 | 4 | 13 | 40 | 120 | 354 | 1031 | 2972 | 8495
| 1 | 7 | 33 | 132 | 483 | 1671 | 5561 | 17984
| 1 | 10 | 62 | 308 | 1345 | 5398 | 20410
| 1 | 13 | 100 | 595 | 3030 | 13893
| 1 | 16 | 147 | 1020 | 5943
| 1 | 19 | 203 | 1610
| 1 | 22 | 268
| 1 | 25
| 1
|
A238731 as an upper right triangle
1 | 1 | 2 | 5 | 13 | 34 | 89 | 233 | 610 | 1597 | 4181
| | 1 | 4 | 13 | 40 | 120 | 354 | 1031 | 2972 | 8495
| | | 1 | 7 | 33 | 132 | 483 | 1671 | 5561 | 17984
| | | | 1 | 10 | 62 | 308 | 1345 | 5398 | 20410
| | | | | 1 | 13 | 100 | 595 | 3030 | 13893
| | | | | | 1 | 16 | 147 | 1020 | 5943
| | | | | | | 1 | 19 | 203 | 1610
| | | | | | | | 1 | 22 | 268
| | | | | | | | | 1 | 25
| | | | | | | | | | 1
| | | | | | | | | |
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