A198787 as a triangular array
| | | | | | | | | | | | | 0 |
| | | | | | | | | | | | | 0 | | 1 |
| | | | | | | | | | | | 0 | | 2 | | 3 |
| | | | | | | | | | | 0 | | 4 | | 5 | | 6 |
| | | | | | | | | | 0 | | 6 | | 8 | | 9 | | 10 |
| | | | | | | | | 0 | | 9 | | 12 | | 13 | | 14 | | 15 |
| | | | | | | | 0 | | 12 | | 16 | | 18 | | 19 | | 20 | | 21 |
| | | | | | | 0 | | 16 | | 21 | | 24 | | 25 | | 26 | | 27 | | 28 |
| | | | | | 0 | | 20 | | 27 | | 30 | | 32 | | 33 | | 34 | | 35 | | 36 |
| | | | | 0 | | 25 | | 33 | | 37 | | 40 | | 41 | | 42 | | 43 | | 44 | | 45 |
| | | | 0 | | 30 | | 40 | | 45 | | 48 | | 50 | | 51 | | 52 | | 53 | | 54 | | 55 |
| | | 0 | | 36 | | 48 | | 54 | | 57 | | 60 | | 61 | | 62 | | 63 | | 64 | | 65 | | 66 |
| | 0 | | 42 |
|
A198787 as a square array
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
| 1 | 2 | 4 | 6 | 9 | 12 | 16 | 20 | 25 | 30 | 36 | 42
| 3 | 5 | 8 | 12 | 16 | 21 | 27 | 33 | 40 | 48
| 6 | 9 | 13 | 18 | 24 | 30 | 37 | 45 | 54
| 10 | 14 | 19 | 25 | 32 | 40 | 48 | 57
| 15 | 20 | 26 | 33 | 41 | 50 | 60
| 21 | 27 | 34 | 42 | 51 | 61
| 28 | 35 | 43 | 52 | 62
| 36 | 44 | 53 | 63
| 45 | 54 | 64
| 55 | 65
| 66
|
A198787 as an upper right triangle
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
| | 1 | 2 | 4 | 6 | 9 | 12 | 16 | 20 | 25 | 30 | 36 | 42
| | | 3 | 5 | 8 | 12 | 16 | 21 | 27 | 33 | 40 | 48
| | | | 6 | 9 | 13 | 18 | 24 | 30 | 37 | 45 | 54
| | | | | 10 | 14 | 19 | 25 | 32 | 40 | 48 | 57
| | | | | | 15 | 20 | 26 | 33 | 41 | 50 | 60
| | | | | | | 21 | 27 | 34 | 42 | 51 | 61
| | | | | | | | 28 | 35 | 43 | 52 | 62
| | | | | | | | | 36 | 44 | 53 | 63
| | | | | | | | | | 45 | 54 | 64
| | | | | | | | | | | 55 | 65
| | | | | | | | | | | | 66
| | | | | | | | | | | |
|
|