A178831 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 3 |
| | | | | | | | | 1 | | 9 | | 6 |
| | | | | | | | 1 | | 21 | | 30 | | 10 |
| | | | | | | 1 | | 45 | | 114 | | 70 | | 15 |
| | | | | | 1 | | 93 | | 390 | | 370 | | 135 | | 21 |
| | | | | 1 | | 189 | | 1266 | | 1750 | | 915 | | 231 | | 28 |
| | | | 1 | | 381 | | 3990 | | 7810 | | 5535 | | 1911 | | 364 | | 36 |
| | | 1 | | 765 | | 12354 | | 33670 | | 31515 | | 14091 | | 3556 | | 540 | | 45 |
| | 1 | | 1533 | | 37830 | | 141970 | | 172935 | | 97671 | | 30940 | | 6084 | | 765 | | 55 |
|
A178831 as a square array
1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| 3 | 9 | 21 | 45 | 93 | 189 | 381 | 765 | 1533
| 6 | 30 | 114 | 390 | 1266 | 3990 | 12354 | 37830
| 10 | 70 | 370 | 1750 | 7810 | 33670 | 141970
| 15 | 135 | 915 | 5535 | 31515 | 172935
| 21 | 231 | 1911 | 14091 | 97671
| 28 | 364 | 3556 | 30940
| 36 | 540 | 6084
| 45 | 765
| 55
|
A178831 as an upper right triangle
1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 3 | 9 | 21 | 45 | 93 | 189 | 381 | 765 | 1533
| | | 6 | 30 | 114 | 390 | 1266 | 3990 | 12354 | 37830
| | | | 10 | 70 | 370 | 1750 | 7810 | 33670 | 141970
| | | | | 15 | 135 | 915 | 5535 | 31515 | 172935
| | | | | | 21 | 231 | 1911 | 14091 | 97671
| | | | | | | 28 | 364 | 3556 | 30940
| | | | | | | | 36 | 540 | 6084
| | | | | | | | | 45 | 765
| | | | | | | | | | 55
|
|