A225281 as a triangular array
| | | | | | | | | | | | | 1 |
| | | | | | | | | | | | | 2 | | 1 |
| | | | | | | | | | | | 3 | | 3 | | 1 |
| | | | | | | | | | | 4 | | 6 | | 4 | | 1 |
| | | | | | | | | | 5 | | 9 | | 9 | | 5 | | 1 |
| | | | | | | | | 6 | | 14 | | 15 | | 12 | | 6 | | 1 |
| | | | | | | | 7 | | 19 | | 26 | | 21 | | 15 | | 7 | | 1 |
| | | | | | | 8 | | 25 | | 36 | | 36 | | 27 | | 18 | | 8 | | 1 |
| | | | | | 9 | | 32 | | 49 | | 51 | | 46 | | 33 | | 21 | | 9 | | 1 |
| | | | | 10 | | 39 | | 66 | | 71 | | 66 | | 56 | | 39 | | 24 | | 10 | | 1 |
| | | | 11 | | 47 | | 85 | | 94 | | 92 | | 81 | | 66 | | 45 | | 27 | | 11 | | 1 |
| | | 12 | | 56 | | 103 | | 123 | | 122 | | 113 | | 96 | | 76 | | 51 | | 30 | | 12 | | 1 |
| | 13 | | 64 |
|
A225281 as a square array
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13
| 1 | 3 | 6 | 9 | 14 | 19 | 25 | 32 | 39 | 47 | 56 | 64
| 1 | 4 | 9 | 15 | 26 | 36 | 49 | 66 | 85 | 103
| 1 | 5 | 12 | 21 | 36 | 51 | 71 | 94 | 123
| 1 | 6 | 15 | 27 | 46 | 66 | 92 | 122
| 1 | 7 | 18 | 33 | 56 | 81 | 113
| 1 | 8 | 21 | 39 | 66 | 96
| 1 | 9 | 24 | 45 | 76
| 1 | 10 | 27 | 51
| 1 | 11 | 30
| 1 | 12
| 1
|
A225281 as an upper right triangle
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13
| | 1 | 3 | 6 | 9 | 14 | 19 | 25 | 32 | 39 | 47 | 56 | 64
| | | 1 | 4 | 9 | 15 | 26 | 36 | 49 | 66 | 85 | 103
| | | | 1 | 5 | 12 | 21 | 36 | 51 | 71 | 94 | 123
| | | | | 1 | 6 | 15 | 27 | 46 | 66 | 92 | 122
| | | | | | 1 | 7 | 18 | 33 | 56 | 81 | 113
| | | | | | | 1 | 8 | 21 | 39 | 66 | 96
| | | | | | | | 1 | 9 | 24 | 45 | 76
| | | | | | | | | 1 | 10 | 27 | 51
| | | | | | | | | | 1 | 11 | 30
| | | | | | | | | | | 1 | 12
| | | | | | | | | | | | 1
| | | | | | | | | | | |
|
|