A221918 as a triangular array
| | | | | | | | | | | | 1 |
| | | | | | | | | | | | 2 | | 1 |
| | | | | | | | | | | 3 | | 6 | | 3 |
| | | | | | | | | | 4 | | 4 | | 12 | | 2 |
| | | | | | | | | 5 | | 10 | | 15 | | 20 | | 5 |
| | | | | | | | 6 | | 3 | | 2 | | 12 | | 30 | | 3 |
| | | | | | | 7 | | 14 | | 21 | | 28 | | 35 | | 42 | | 7 |
| | | | | | 8 | | 8 | | 24 | | 8 | | 40 | | 24 | | 56 | | 4 |
| | | | | 9 | | 18 | | 9 | | 36 | | 45 | | 18 | | 63 | | 72 | | 9 |
| | | | 10 | | 5 | | 30 | | 20 | | 10 | | 15 | | 70 | | 40 | | 90 | | 5 |
| | | 11 | | 22 | | 33 | | 44 | | 55 | | 66 | | 77 | | 88 | | 99 | | 110 | | 11 |
| | 12 | | 12 | | 12 | | 3 | | 60 | | 4 | | 84 | | 24 | | 36 | | 60 | | 132 | | 6 |
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A221918 as a square array
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12
| 1 | 6 | 4 | 10 | 3 | 14 | 8 | 18 | 5 | 22 | 12
| 3 | 12 | 15 | 2 | 21 | 24 | 9 | 30 | 33 | 12
| 2 | 20 | 12 | 28 | 8 | 36 | 20 | 44 | 3
| 5 | 30 | 35 | 40 | 45 | 10 | 55 | 60
| 3 | 42 | 24 | 18 | 15 | 66 | 4
| 7 | 56 | 63 | 70 | 77 | 84
| 4 | 72 | 40 | 88 | 24
| 9 | 90 | 99 | 36
| 5 | 110 | 60
| 11 | 132
| 6
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A221918 as an upper right triangle
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12
| | 1 | 6 | 4 | 10 | 3 | 14 | 8 | 18 | 5 | 22 | 12
| | | 3 | 12 | 15 | 2 | 21 | 24 | 9 | 30 | 33 | 12
| | | | 2 | 20 | 12 | 28 | 8 | 36 | 20 | 44 | 3
| | | | | 5 | 30 | 35 | 40 | 45 | 10 | 55 | 60
| | | | | | 3 | 42 | 24 | 18 | 15 | 66 | 4
| | | | | | | 7 | 56 | 63 | 70 | 77 | 84
| | | | | | | | 4 | 72 | 40 | 88 | 24
| | | | | | | | | 9 | 90 | 99 | 36
| | | | | | | | | | 5 | 110 | 60
| | | | | | | | | | | 11 | 132
| | | | | | | | | | | | 6
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