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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 9 |
| 4 | 15 |
| 5 | 30 |
| 6 | 105 |
| 7 | 420 |
| 8 | 2310 |
| 9 | 3465 |
| 10 | 15015 |
| 11 | 180180 |
| 12 | 765765 |
| 13 | 4084080 |
| 14 | 106696590 |
| 15 | 247342095 |
| 16 | 892371480 |
| 17 | 3011753745 |
| 18 | 9704539845 |
| 19 | 100280245065 |
| 20 | 103515091680 |
| 21 | 4412330782860 |
| 22 | 29682952539240 |
| 23 | 634473110526255 |
| 24 | 22514519501013540 |
[4,6,9,15,30,105,420,2310,3465,15015,180180, 765765,4084080,106696590,247342095,892371480, 3011753745,9704539845,100280245065,103515091680, 4412330782860,29682952539240,634473110526255, 22514519501013540] |