A081281 as a triangular array
| | | | | | | | | | | 1 |
| | | | | | | | | | | 1 | | 2 |
| | | | | | | | | | 1 | | 4 | | 5 |
| | | | | | | | | 1 | | 6 | | 15 | | 14 |
| | | | | | | | 1 | | 8 | | 29 | | 54 | | 41 |
| | | | | | | 1 | | 10 | | 47 | | 126 | | 189 | | 122 |
| | | | | | 1 | | 12 | | 69 | | 238 | | 513 | | 648 | | 365 |
| | | | | 1 | | 14 | | 95 | | 398 | | 1101 | | 1998 | | 2187 | | 1094 |
| | | | 1 | | 16 | | 125 | | 614 | | 2057 | | 4788 | | 7533 | | 7290 | | 3281 |
| | | 1 | | 18 | | 159 | | 894 | | 3501 | | 9858 | | 19899 | | 27702 | | 24057 | | 9842 |
| | 1 | | 20 | | 197 | | 1246 |
|
A081281 as a square array
1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20
| 5 | 15 | 29 | 47 | 69 | 95 | 125 | 159 | 197
| 14 | 54 | 126 | 238 | 398 | 614 | 894 | 1246
| 41 | 189 | 513 | 1101 | 2057 | 3501
| 122 | 648 | 1998 | 4788 | 9858
| 365 | 2187 | 7533 | 19899
| 1094 | 7290 | 27702
| 3281 | 24057
| 9842
|
A081281 as an upper right triangle
1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20
| | | 5 | 15 | 29 | 47 | 69 | 95 | 125 | 159 | 197
| | | | 14 | 54 | 126 | 238 | 398 | 614 | 894 | 1246
| | | | | 41 | 189 | 513 | 1101 | 2057 | 3501
| | | | | | 122 | 648 | 1998 | 4788 | 9858
| | | | | | | 365 | 2187 | 7533 | 19899
| | | | | | | | 1094 | 7290 | 27702
| | | | | | | | | 3281 | 24057
| | | | | | | | | | 9842
| | | | | | | | | |
|
|