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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 9 |
| 4 | 15 |
| 5 | 30 |
| 6 | 105 |
| 7 | 210 |
| 8 | 2310 |
| 9 | 3465 |
| 10 | 15015 |
| 11 | 120120 |
| 12 | 765765 |
| 13 | 4084080 |
| 14 | 33948915 |
| 15 | 106696590 |
| 16 | 334639305 |
| 17 | 892371480 |
| 18 | 3234846615 |
| 19 | 71166625530 |
| 20 | 100280245065 |
| 21 | 200560490130 |
| 22 | 3710369067405 |
| 23 | 29682952539240 |
| 24 | 1369126185872445 |
[4,6,9,15,30,105,210,2310,3465,15015,120120, 765765,4084080,33948915,106696590,334639305, 892371480,3234846615,71166625530,100280245065, 200560490130,3710369067405,29682952539240, 1369126185872445] |