A172381 as a triangular array
| | | | | | | | | | | 1 |
| | | | | | | | | | | 1 | | 1 |
| | | | | | | | | | 2 | | 3 | | 1 |
| | | | | | | | | 5 | | 10 | | 6 | | 1 |
| | | | | | | | 14 | | 36 | | 31 | | 10 | | 1 |
| | | | | | | 42 | | 137 | | 156 | | 75 | | 15 | | 1 |
| | | | | | 132 | | 544 | | 787 | | 510 | | 155 | | 21 | | 1 |
| | | | | 429 | | 2235 | | 4017 | | 3331 | | 1380 | | 287 | | 28 | | 1 |
| | | | 1430 | | 9445 | | 20809 | | 21405 | | 11411 | | 3255 | | 490 | | 36 | | 1 |
| | | 4862 | | 40876 | | 109486 | | 136921 | | 90665 | | 33390 | | 6916 | | 786 | | 45 | | 1 |
| | 16796 |
|
A172381 as a square array
| 1 | 1 | 2 | 5 | 14 | 42 | 132 | 429 | 1430 | 4862 | 16796
| | 1 | 3 | 10 | 36 | 137 | 544 | 2235 | 9445 | 40876
| | 1 | 6 | 31 | 156 | 787 | 4017 | 20809 | 109486
| | 1 | 10 | 75 | 510 | 3331 | 21405 | 136921
| | 1 | 15 | 155 | 1380 | 11411 | 90665
| | 1 | 21 | 287 | 3255 | 33390
| | 1 | 28 | 490 | 6916
| | 1 | 36 | 786
| | 1 | 45
| | 1
|
A172381 as an upper right triangle
| 1 | 1 | 2 | 5 | 14 | 42 | 132 | 429 | 1430 | 4862 | 16796
| | 1 | 3 | 10 | 36 | 137 | 544 | 2235 | 9445 | 40876
| | | 1 | 6 | 31 | 156 | 787 | 4017 | 20809 | 109486
| | | | 1 | 10 | 75 | 510 | 3331 | 21405 | 136921
| | | | | 1 | 15 | 155 | 1380 | 11411 | 90665
| | | | | | 1 | 21 | 287 | 3255 | 33390
| | | | | | | 1 | 28 | 490 | 6916
| | | | | | | | 1 | 36 | 786
| | | | | | | | | 1 | 45
| | | | | | | | | | 1
| | | | | | | | | |
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