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| n | a(n) |
|---|---|
| 1 | 18 |
| 2 | 120 |
| 3 | 2160 |
| 4 | 24120 |
| 5 | 476298 |
| 6 | 6701732 |
| 7 | 129263994 |
| 8 | 2034174870 |
| 9 | 38872156608 |
| 10 | 638334265140 |
| 11 | 12063810334392 |
| 12 | 203277623324301 |
| 13 | 3807709928026200 |
| 14 | 65141220918760312 |
| 15 | 1212020863903182816 |
| 16 | 20946272883788339613 |
[18,120,2160,24120,476298,6701732,129263994, 2034174870,38872156608,638334265140, 12063810334392,203277623324301,3807709928026200, 65141220918760312,1212020863903182816, 20946272883788339613] |