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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 5 |
| 3 | 30 |
| 4 | 30 |
| 5 | 180 |
| 6 | 180 |
| 7 | 1080 |
| 8 | 1080 |
| 9 | 6480 |
| 10 | 6480 |
| 11 | 38880 |
| 12 | 38880 |
| 13 | 233280 |
| 14 | 233280 |
| 15 | 1399680 |
| 16 | 1399680 |
| 17 | 8398080 |
| 18 | 8398080 |
| 19 | 50388480 |
| 20 | 50388480 |
| 21 | 302330880 |
| 22 | 302330880 |
| 23 | 1813985280 |
| 24 | 1813985280 |
| 25 | 10883911680 |
| 26 | 10883911680 |
| 27 | 65303470080 |
| 28 | 65303470080 |
| 29 | 391820820480 |
| 30 | 391820820480 |
[5,5,30,30,180,180,1080,1080,6480,6480,38880, 38880,233280,233280,1399680,1399680,8398080, 8398080,50388480,50388480,302330880,302330880, 1813985280,1813985280,10883911680,10883911680, 65303470080,65303470080,391820820480,391820820480] |